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 A357087 #9 Sep 11 2022 10:06:59 %S A357087 1,0,0,6,36,150,2340,47166,676116,10602150,248197860,6304530606, %T A357087 154511054676,4227889233750,134462460901860,4519745455581726, %U A357087 157756124072317716,5960350758700381830,243292987180534250340,10433760831781705395726,469420864688765414084436 %N A357087 E.g.f. satisfies A(x) * log(A(x)) = (exp(x*A(x)) - 1)^3. %F A357087 a(n) = Sum_{k=0..floor(n/3)} (3*k)! * (n-k+1)^(k-1) * Stirling2(n,3*k)/k!. %o A357087 (PARI) a(n) = sum(k=0, n\3, (3*k)!*(n-k+1)^(k-1)*stirling(n, 3*k, 2)/k!); %Y A357087 Cf. A349588, A357086. %Y A357087 Cf. A357085, A357089. %K A357087 nonn %O A357087 0,4 %A A357087 _Seiichi Manyama_, Sep 11 2022