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 A086895 #6 Jan 27 2020 18:49:34
%S A086895 1,4,329,164410,217010257,592437912176,2900576017215049,
%T A086895 23146596617368286854,281092269321320392419425,
%U A086895 4933169326589172885999647452,120172004795712251502939402381001,3933950748992436265200224114943085394,168530450086835969601177601081838249796529
%N A086895 a(n) = 1/3!*(A000522(3*n) + 3*A000522(n) + 2).
%H A086895 Andrew Howroyd, <a href="/A086895/b086895.txt">Table of n, a(n) for n = 0..100</a>
%o A086895 (PARI) \\ here b(n) is A000522(n).
%o A086895 b(n)={sum(k=0, n, binomial(n, k)*k!)}
%o A086895 a(n)={(b(3*n) + 3*b(n) + 2) / 6} \\ _Andrew Howroyd_, Jan 27 2020
%Y A086895 Cf. A000522, A008290.
%K A086895 nonn
%O A086895 0,2
%A A086895 _Vladeta Jovovic_, Aug 22 2003
%E A086895 Terms a(11) and beyond from _Andrew Howroyd_, Jan 27 2020