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 A144896 #6 Jul 04 2023 13:49:26 %S A144896 1,2,10,44,228,1272,8760,63936,547776,5145984,54233280,624291840, %T A144896 7879472640,107423677440,1579212910080,24832164556800,416273901926400, %U A144896 7403098797158400,139238590721126400,2760253302701260800,57522218527420416000,1256931901812400128000 %N A144896 Third column of triangle A134134 (S2'(2)= S1hat(2)). %F A144896 a(n) = A134134(n+3,3), n>=0. %Y A144896 Cf. A134134, A000142 (factorials, first column). A144895 (second column). %K A144896 nonn,easy %O A144896 0,2 %A A144896 _Wolfdieter Lang_, Oct 09 2008