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 A381595 #10 Mar 01 2025 08:36:12 %S A381595 1,3,24,280,4044,67365,1246534,25051422,538836147,12279937669, %T A381595 294374405652,7382843258466,192917842671564,5235276617405133, %U A381595 147163222059602313,4275948043251399950,128196303568520249238,3959890522003241945409,125863828745364900374059 %N A381595 G.f. A(x) satisfies A(x) = 1/(1 - x * A(x) * A(x*A(x)))^3. %F A381595 See A381594. %F A381595 G.f.: B(x)^3, where B(x) is the g.f. of A381601. %o A381595 (PARI) a(n, k=3) = if(k==0, 0^n, k*sum(j=0, n, binomial(3*n+j+k, j)/(3*n+j+k)*a(n-j, 3*j))); %Y A381595 Column k=3 of A381594. %Y A381595 Cf. A088714, A381593. %Y A381595 Cf. A145160, A381574, A381601. %K A381595 nonn %O A381595 0,2 %A A381595 _Seiichi Manyama_, Mar 01 2025