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 A365893 #11 Sep 23 2023 07:23:40
%S A365893 1,0,0,1,0,0,10,0,1,280,0,165,15400,1,30030,1401400,6995,6806800,
%T A365893 190590401,6506835,1939938000,36212380820,4940624150,687126039601,
%U A365893 9163671323015,3761116975000,297754623925175,2982764271647875,3067236941769001
%N A365893 Expansion of e.g.f. exp( Sum_{k>=0} x^(5*k+3) / (5*k+3)! ).
%H A365893 Seiichi Manyama, <a href="/A365893/b365893.txt">Table of n, a(n) for n = 0..613</a>
%F A365893 a(0) = 1; a(n) = Sum_{k=0..floor((n-3)/5)} binomial(n-1,5*k+2) * a(n-5*k-3).
%o A365893 (PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(sum(k=0, N\5, x^(5*k+3)/(5*k+3)!))))
%Y A365893 Cf. A006505, A009227, A307978.
%K A365893 nonn
%O A365893 0,7
%A A365893 _Seiichi Manyama_, Sep 22 2023