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 A361354 #10 Oct 15 2024 18:06:58 %S A361354 1,1,2,6,32,218,2060,23054,314242,4897410,87427276,1741312444, %T A361354 38482278928,931618115860,24554678866736,699328394272236, %U A361354 21410158708401980,701011980397033052,24445424273647475096,904440666571331841992,35386719095200164370912,1459756349974815778252152 %N A361354 Number of simple quasi series-parallel matroids on [n]. %H A361354 Andrew Howroyd, <a href="/A361354/b361354.txt">Table of n, a(n) for n = 1..200</a> %H A361354 Luis Ferroni and Matt Larson, <a href="https://arxiv.org/abs/2303.02253">Kazhdan-Lusztig polynomials of braid matroids</a>, arXiv:2303.02253 [math.CO], 2023. %F A361354 E.g.f.: B(1 + log(x))/(1 + x) - 1 where B(x) is the e.g.f. of A359986. %F A361354 E.g.f.: exp(B(x)) where B(x) is the e.g.f. of A007834. %o A361354 (PARI) seq(n) = Vec(serlaplace( -1 + subst(exp(2*x + intformal(-x + 2*serreverse(1 + 2*x - exp(x + O(x^n))))), x, log(1 + x + O(x*x^n)))/(1 + x) )) %Y A361354 Row sums of A361353. %Y A361354 Cf. A007834, A359986. %K A361354 nonn %O A361354 1,3 %A A361354 _Andrew Howroyd_, Mar 09 2023