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 A380629 #5 Jan 29 2025 21:30:57
%S A380629 1,2,3,9,26,135,1124,11225,143600,2156862,36069006,681844857,
%T A380629 14387370477,327462904319,8171705457024,221137571070305,
%U A380629 6373582250114091,197210862517274355,6521583445100185049,227168823675390365225,8396976723995537706278,327880018217851412105973
%N A380629 Number of sensed regular combinatorial maps with n edges.
%H A380629 Andrew Howroyd, <a href="/A380629/b380629.txt">Table of n, a(n) for n = 0..200</a>
%F A380629 a(n) = Sum_{d|2*n} A380626(d,2*n/d) for n > 0.
%o A380629 (PARI) a(n)={if(n==0, 1, sumdiv(2*n, d, T(d,2*n/d)))} \\ T(n,k) defined in A380622.
%Y A380629 Cf. A170946, A380625 (rooted), A380626.
%K A380629 nonn
%O A380629 0,2
%A A380629 _Andrew Howroyd_, Jan 29 2025