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 A367060 #10 Nov 04 2023 10:12:06
%S A367060 1,1,3,13,62,318,1718,9627,55437,326070,1950630,11831706,72597453,
%T A367060 449804148,2810260317,17685019893,111997074910,713223954540,
%U A367060 4564502770117,29341499243806,189364923816282,1226535071582818,7970416067268898,51949175133236526
%N A367060 G.f. satisfies A(x) = 1 + x*A(x)^3 + x^3*A(x)^4.
%F A367060 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-2*k+1,k) * binomial(3*n-5*k,n-3*k)/(2*n-2*k+1).
%o A367060 (PARI) a(n) = sum(k=0, n\3, binomial(2*n-2*k+1, k)*binomial(3*n-5*k, n-3*k)/(2*n-2*k+1));
%Y A367060 Cf. A366676, A367057, A367058, A367059, A367061, A367062.
%K A367060 nonn
%O A367060 0,3
%A A367060 _Seiichi Manyama_, Nov 04 2023