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 A368719 #13 Jan 13 2024 06:48:59 %S A368719 0,1,34,345,2404,15145,98646,707329,5691400,51281649,512916490, %T A368719 5642242441,67707158124,880193426905,12322708514494,184840628476785, %U A368719 2957450056677136,50276650964931169,904979717370650610,17194614630044837689,343892292600899953780 %N A368719 a(n) = n! * Sum_{k=0..n} k^5 / k!. %H A368719 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BellPolynomial.html">Bell Polynomial</a>. %H A368719 Wikipedia, <a href="https://en.wikipedia.org/wiki/Touchard_polynomials">Touchard polynomials</a> %F A368719 a(0) = 0; a(n) = n*a(n-1) + n^5. %F A368719 E.g.f.: B_5(x) * exp(x) / (1-x), where B_n(x) = Bell polynomials. %F A368719 a(n) ~ 52*exp(1)*n!. - _Vaclav Kotesovec_, Jan 13 2024 %o A368719 (PARI) my(N=30, x='x+O('x^N)); concat(0, Vec(serlaplace(sum(k=0, 5, stirling(5, k, 2)*x^k)*exp(x)/(1-x)))) %Y A368719 Column k=5 of A337085. %Y A368719 Cf. A048993, A368718. %K A368719 nonn %O A368719 0,3 %A A368719 _Seiichi Manyama_, Jan 04 2024