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 A364626 #8 Jul 30 2023 09:56:36
%S A364626 1,3,7,19,63,231,895,3615,15055,64111,277791,1220767,5427775,24371199,
%T A364626 110350335,503289727,2309992959,10661634303,49452179455,230391918591,
%U A364626 1077644520703,5058766156543,23824929459711,112541456498175,533063457631231,2531252417738751
%N A364626 G.f. satisfies A(x) = 1/(1-x)^3 + x^2*A(x)^3.
%F A364626 a(n) = Sum_{k=0..floor(n/2)} binomial(n+4*k+2,6*k+2) * binomial(3*k,k) / (2*k+1).
%o A364626 (PARI) a(n) = sum(k=0, n\2, binomial(n+4*k+2, 6*k+2)*binomial(3*k, k)/(2*k+1));
%Y A364626 Cf. A364625, A364627.
%Y A364626 Cf. A086631.
%K A364626 nonn
%O A364626 0,2
%A A364626 _Seiichi Manyama_, Jul 30 2023