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 A375086 #8 Mar 30 2025 04:39:02
%S A375086 0,1,3,8,24,78,268,956,3496,12998,48876,185268,706456,2706204,
%T A375086 10404696,40124792,155133904,601113158,2333671756,9075266372,
%U A375086 35345525944,137847053108,538258923016,2104101060872,8233434921904,32247612071708,126410623214968,495918566502536
%N A375086 Row sums of A375085.
%F A375086 a(n) = (2^(n+1) + 4^n + 4*binomial(2*n-2,n-1) - 8*binomial(2*n-2,n-2)*hypergeom([1, 2-n], [1+n], -1))/8 for n > 1.
%F A375086 a(n) ~ A007582(n+2).
%t A375086 a[n_]:=(2^(n+1)+4^n+4Binomial[2n-2,n-1]-8Binomial[2n-2,n-2]Hypergeometric2F1[1,2-n,1+n,-1])/8; Join[{0,1},Array[a,26,2]]
%Y A375086 Cf. A375085.
%Y A375086 Cf. A000079, A000302, A000346, A000984, A001791, A007582.
%K A375086 nonn
%O A375086 0,3
%A A375086 _Stefano Spezia_, Jul 29 2024