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 A380843 #4 Feb 05 2025 22:05:16
%S A380843 1,1,2,7,35,237,2040,21255,259591,3633549,57320398,1005959831,
%T A380843 19436938571,409965565469,9372278051700,230832086585495,
%U A380843 6093185704307967,171604903098322813,5136091192685429770,162792009969153667111,5447239135976543715731,191888373741260775025741
%N A380843 Antidiagonal sums of the array A380841.
%t A380843 A380841[n_,k_]:=n!SeriesCoefficient[1/(1-x*Exp[x])^k,{x,0,n}]; a[n_]:=Sum[A380841[n-k,k],{k,0,n}]; Array[a,22,0]
%Y A380843 Cf. A380841.
%K A380843 nonn
%O A380843 0,3
%A A380843 _Stefano Spezia_, Feb 05 2025