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 A361476 #11 Nov 12 2024 11:26:44
%S A361476 0,1,4,12,34,99,308,1040,3820,15197,65060,297828,1449742,7468527,
%T A361476 40555732,231335944,1381989864,8623700793,56078446596,379233142780,
%U A361476 2662013133274,19362917621979,145719550012276,1133023004941248,9090156910550084,75161929739797493,639793220877941476
%N A361476 Antidiagonal sums of A361475.
%H A361476 Robert Israel, <a href="/A361476/b361476.txt">Table of n, a(n) for n = 0..596</a>
%F A361476 a(n) = Sum_{k=2..n+2} (k^(n-k+2) - 1)/(k - 1).
%F A361476 a(n) ~ A026898(n).
%F A361476 a(n) = Sum_{k=0..n} k * A104878(n,k). - _Alois P. Heinz_, Dec 05 2023
%p A361476 f:= proc(n) local k;
%p A361476 add( (k^(n-k+2) - 1)/(k - 1),k=2..n+2)
%p A361476 end proc:
%p A361476 map(f, [$0..30]); # _Robert Israel_, Nov 12 2024
%t A361476 A361475[n_,k_]:=(k^n-1)/(k-1); a[n_]:=Sum[A361475[n-k+2,k],{k,2,n+2}]; Array[a,27,0]
%Y A361476 Cf. A026898, A104878, A361475.
%K A361476 nonn
%O A361476 0,3
%A A361476 _Stefano Spezia_, Mar 13 2023