This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A132441 #9 Feb 17 2019 09:21:42
%S A132441 1,1,2,5,12,31,88,263,814,2604,8575,28936,99726,350151,1249865
%N A132441 Number of 3-noncrossing stack-free partial matchings without 1-arcs.
%D A132441 Emma Y. Jin and Christian M. Reidys. RNA-Lego: Combinatorial design of pseudoknot RNA, Bull. Math. Bio. 2007, submit
%H A132441 Emma Y. Jin and Christian M. Reidys, <a href="http://arxiv.org/abs/0711.1405">RNA-LEGO: Combinatorial Design of Pseudoknot RNA</a>, arXiv:0711.1405 [q-bio.BM], 2007.
%F A132441 C_k(n,h) = Sum_{b=0..h-1} (-1)^(h-b-1)*(binomial(h-1, b)*{T}_k(h-2h+2b+2,b+1).
%K A132441 nonn
%O A132441 1,3
%A A132441 Emma. Y. Jin (emma(AT)cfc.nankai.edu.cn), Nov 13 2007