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 A367058 #10 Nov 04 2023 10:12:14
%S A367058 1,1,3,13,60,301,1595,8774,49631,286870,1686876,10059301,60689041,
%T A367058 369762262,2271892435,14060917955,87579290486,548558815484,
%U A367058 3453077437532,21833406999880,138603490377008,883075187803622,5644796991703781,36191055027026410
%N A367058 G.f. satisfies A(x) = 1 + x*A(x)^3 + x^3*A(x)^2.
%F A367058 a(n) = Sum_{k=0..floor(n/3)} binomial(2*n-4*k+1,k) * binomial(3*n-7*k,n-3*k)/(2*n-4*k+1).
%o A367058 (PARI) a(n) = sum(k=0, n\3, binomial(2*n-4*k+1, k)*binomial(3*n-7*k, n-3*k)/(2*n-4*k+1));
%Y A367058 Cf. A366676, A367057, A367059, A367060, A367061, A367062.
%K A367058 nonn
%O A367058 0,3
%A A367058 _Seiichi Manyama_, Nov 04 2023