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 A361282 #18 Mar 09 2023 20:03:59 %S A361282 0,1,75,9345,1865745,554479695,231052877055,128938132548225, %T A361282 92986310399407425,84250567868935042575,93744545254140599193375, %U A361282 125717783386887888296925825,200041202339679732328342670625,372688996228146502285257581079375,803768398459351988653830600415029375 %N A361282 Number of rank n+1 simple connected series-parallel matroids on [2n]. %H A361282 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. %e A361282 For n=2 the a(2) = 1 rank 3 simple connected series-parallel matroid on [4] is the uniform matroid of rank 3. %o A361282 (PARI) a(n) = T(2*n)[2*n][n+1] \\ T(n) defined in A361355. - _Andrew Howroyd_, Mar 09 2023 %Y A361282 Cf. A034941, A361355. %K A361282 nonn %O A361282 1,3 %A A361282 _Matt Larson_, Mar 06 2023 %E A361282 Terms a(10)-a(15) from _Andrew Howroyd_, Mar 09 2023