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 A375549 #8 Sep 23 2024 11:32:54
%S A375549 1,7,33,129,450,1452,4424,12896,36288,99200,264704,691968,1777152,
%T A375549 4494336,11212800,27639808,67403776,162791424,389742592,925696000,
%U A375549 2182742016,5112594432,11901861888,27550285824,63438848000,145366188032,331584897024,753146003456,1703860502528
%N A375549 Row sums of A375550.
%F A375549 a(n) ~ 2^(n-6) * n^4 / 3. - _Vaclav Kotesovec_, Sep 23 2024
%t A375549 Table[Sum[Binomial[n+1, n-k] * HypergeometricPFQ[{4, k-n}, {k+2}, -1], {k, 0, n}], {n, 0, 30}] (* _Vaclav Kotesovec_, Sep 23 2024 *)
%Y A375549 Cf. A375550.
%K A375549 nonn
%O A375549 0,2
%A A375549 _Peter Luschny_, Sep 23 2024