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 A380619 #7 Jan 28 2025 20:51:06
%S A380619 1,5,34,288,3102,39242,573654,9484003,175036065,3568736050,
%T A380619 79697415569,1935425955944,50794210191337,1432898704970561,
%U A380619 43244525933606928,1390448844972918928,47455314531812444788,1713525997666221196906,65266335503957271588042,2615307907226341637828915
%N A380619 Number of sensed combinatorial maps with n edges and 3 vertices.
%C A380619 By duality, also the number of sensed combinatorial maps with n edges and 3 faces.
%H A380619 Andrew Howroyd, <a href="/A380619/b380619.txt">Table of n, a(n) for n = 2..200</a>
%o A380619 (PARI) \\ Needs G(), InvEulerMTS from A380615.
%o A380619 seq(n, k=3)={my(y='y); Vec(polcoef(InvEulerMTS(G(n, y*(1 + O(y^k)))), k, y))}
%Y A380619 Column 3 of A380615.
%Y A380619 Cf. A380618 (2 vertices), A380621 (unsensed).
%K A380619 nonn
%O A380619 2,2
%A A380619 _Andrew Howroyd_, Jan 28 2025