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 A038033 #9 Sep 04 2017 04:31:41 %S A038033 6,24,180,1320,11130,103824,1067976,12014640,146845710,1938363240, %T A038033 27489515196,416924313624,6734931220290,115455963776160, %U A038033 2093601476474640,40040128237577184,805513168073611926 %N A038033 a(n) = A000166(n-1)*n*(n-1). %F A038033 E.g.f.: x^3/((1-x)^2*e^x) %p A038033 a:=n->sum(n!*sum((-1)^k/k!, j=0..n), k=0..n): seq(a(n)*n, n=2..17); # _Zerinvary Lajos_, Dec 18 2007 %Y A038033 Equals 6 * A000313(n+1). %Y A038033 Cf. A000240 %K A038033 nonn,easy %O A038033 3,1 %A A038033 _Christian G. Bower_ from a sequence by _Erich Friedman_