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 A030035 #15 Oct 15 2021 07:31:07
%S A030035 1,1,1,2,4,9,17,38,89,213,480,1151,2810,6978,16497,40731,101680,
%T A030035 256491,623916,1568966,3972773,10130647,25044032,63573638,162478685,
%U A030035 417322917,1049096179,2687278965,6917001254,17882746627,45391766669,116995255065,302689722551
%N A030035 a(n+1) = Sum_{k=0..floor(3*n/4)} a(k) * a(n-k).
%H A030035 Seiichi Manyama, <a href="/A030035/b030035.txt">Table of n, a(n) for n = 0..1000</a>
%o A030035 (PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=1, nn, v[n+2]=sum(k=1, 1+(3*n)\4, v[k]*v[n+2-k])); v; } \\ _Jinyuan Wang_, Mar 18 2020
%Y A030035 Cf. A000992, A030034, A030038.
%K A030035 nonn
%O A030035 0,4
%A A030035 _N. J. A. Sloane_
%E A030035 More terms from _Jinyuan Wang_, Mar 18 2020