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 A036728 #5 Jul 08 2025 21:55:40 %S A036728 1,1,1,4,15,62,274,1260,5973,28975,143176,718070,3645876,18703560, %T A036728 96799076,504797258,2649947859,13992164283,74262871273,395964705460, %U A036728 2119994732940,11392843953996,61432524907686,332279234332898,1802324611950162 %N A036728 G.f. satisfies A(x) = 1 + x*cycle_index(G,A(x)) where G = cyclic group of order 7 generated by (1,2,...,7). %Y A036728 Cf. A036717-A036726. %K A036728 nonn %O A036728 0,4 %A A036728 _N. J. A. Sloane_