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 A030038 #12 Oct 15 2021 21:29:53
%S A030038 1,1,1,2,3,6,13,26,57,117,262,602,1329,3079,6903,16161,38185,87745,
%T A030038 207896,481817,1148246,2755781,6485489,15592656,36899080,88966356,
%U A030038 215687474,515590781,1251629165,2998835401,7291353036,17803231663,42980538045,104981503048,253813177447
%N A030038 a(n+1) = Sum_{k=0..floor(3*n/5)} a(k) * a(n-k).
%H A030038 Seiichi Manyama, <a href="/A030038/b030038.txt">Table of n, a(n) for n = 0..1000</a>
%o A030038 (PARI) lista(nn) = {my(v=vector(nn+2, i, 1)); for(n=1, nn, v[n+2]=sum(k=1, 1+(3*n)\5, v[k]*v[n+2-k])); v; } \\ _Jinyuan Wang_, Mar 18 2020
%Y A030038 Cf. A000992, A030036, A030037, A030039.
%K A030038 nonn
%O A030038 0,4
%A A030038 _N. J. A. Sloane_
%E A030038 More terms from _Jinyuan Wang_, Mar 18 2020