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 A367050 #14 Nov 03 2023 11:20:11
%S A367050 1,1,5,29,198,1469,11518,93875,787392,6752175,58929541,521718814,
%T A367050 4674070602,42296077935,386027716280,3549332631052,32845586854208,
%U A367050 305685481682970,2859315003009776,26866125820982711,253457922829307765,2399910588283502630
%N A367050 G.f. satisfies A(x) = 1 + x*A(x)^4 + x^2*A(x)^3.
%F A367050 a(n) = Sum_{k=0..floor(n/2)} binomial(3*n-3*k+1,k) * binomial(4*n-5*k,n-2*k)/(3*n-3*k+1).
%o A367050 (PARI) a(n) = sum(k=0, n\2, binomial(3*n-3*k+1, k)*binomial(4*n-5*k, n-2*k)/(3*n-3*k+1));
%Y A367050 Cf. A365178, A365180, A365181, A365182, A365183, A367041, A367048, A367049.
%K A367050 nonn
%O A367050 0,3
%A A367050 _Seiichi Manyama_, Nov 03 2023