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 A370913 #9 Mar 06 2024 19:04:34
%S A370913 1,1,2,8,61,731,11894,242986,5959037,170357861,5559592906,
%T A370913 203873583044,8297471638781,371083006046887,18087291356943566,
%U A370913 954257615636120726,54175808937658443709,3293085944438180436161,213379242249449228080322,14681745401633286267344896
%N A370913 a(n) = Sum_{k=0..n} 4^(n - k)*Pochhammer(k/4, n - k). Row sums of A370915(n - k, k).
%t A370913 a[n_] := Sum[4^(n-k) * Pochhammer[k/4, n-k], {k, 0, n}]; Array[a, 20, 0] (* _Amiram Eldar_, Mar 06 2024 *)
%Y A370913 Cf. A370915.
%K A370913 nonn
%O A370913 0,3
%A A370913 _Peter Luschny_, Mar 06 2024