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I'm trying to understand what is the meaning of this statement.

A088518 Symmetric secondary structures of RNA molecules with n nucleotides. 4

%I

%S 1,1,1,2,2,4,5,9,12,21,29,50,71,121,175,296,434,730,1082,1812,2709,

%T 4521,6807,11328,17157,28485,43359,71844,109830,181674,278769,460443,

%U 708840,1169283,1805291,2974574,4604363,7578937,11758552,19337489,30064037

%N Symmetric secondary structures of RNA molecules with n nucleotides.

%C Diagonal sums of triangle in A088855. [From Philippe Deléham, Jan 04 2009]

%C Number of prime symmetric Dyck (n+2)-paths with no ascent of length 1. E.g. the a(3) = 2 5-paths are

UUUUUDDDDD and UUUDDUUDDD. - David Scambler, Aug 27 2012

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closed as unclear what you're asking by AMR, March Ho, AliceD, MattDMo, The Last Word Jan 7 '16 at 5:20

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ which language is that. I really can't understrand it. It certainly isn't python or c, so any guesses? $\endgroup$ – Tusky Jan 6 '16 at 14:25
  • $\begingroup$ Tusky, it's the pseudo code OEIS use. My question is about how I should understand the term symmetric in relation to the secondary structure of RNA molecules. The link was given for context. $\endgroup$ – user20986 Jan 6 '16 at 14:36
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Each one of those lines has a reference to a paper which will help you to understand the calculation that was performed

Read this from your original post https://oeis.org/A088518

Overlapping sequences

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