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 A379588 #7 Dec 26 2024 20:01:52
%S A379588 0,1,11,84,642,5633,59021,736944,10839316,185361065,3637063343,
%T A379588 80939054884,2023405966486,56362728831929,1736960568923505,
%U A379588 58853395571312176,2180579093801111176,87921539854223957169,3841160785119756991059
%N A379588 Antidiagonal sums of the array A379587.
%F A379588 a(n) = Sum_{k=2..n+2} (k^(n-k+2) - 1)^2/(k - 1).
%t A379588 A379587[n_,k_]:=(k^n-1)^2/(k-1); a[n_]:=Sum[A379587[n-k+2,k],{k,2,n+2}]; Array[a,15,0]
%Y A379588 Cf. A361476, A379587.
%K A379588 nonn
%O A379588 0,3
%A A379588 _Stefano Spezia_, Dec 26 2024