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 A258745 #18 Jun 05 2025 12:34:16 %S A258745 1,1,8,336,64512,53329920,184308203520,2621599886868480, %T A258745 152122702768688332800,35820150273699719298416640, %U A258745 34112245508649716682268134604800,131089993748184007771243790830298726400,2029650642403883210241235064170615545004032000 %N A258745 Order of general affine group AGL(n,2) (=A028365(n)) divided by (n+1). %H A258745 Max Alekseyev, <a href="/A258745/b258745.txt">Table of n, a(n) for n = 0..100</a> %H A258745 Abdalla G. M. Ahmed, Matt Pharr, Victor Ostromoukhov, and Hui Huang, <a href="https://arxiv.org/abs/2505.20434">SZ Sequences: Binary-Based (0, 2^q)-Sequences</a>, arXiv:2505.20434 [cs.GR], 2025. See pp. 7, 12. %H A258745 Putnam Exam. 1999, <a href="http://math.ucsd.edu/~pfitz/downloads/putnam/putnam1999.pdf">Question A6</a>, Amer. Math. Monthly 107 (Oct 2000), 721-732; see p. 725. %F A258745 a(n) = A028365(n) / (n+1) = 2^n * A002884(n) / (n+1) = 2^n * n! * A053601(n) / (n+1). %K A258745 nonn %O A258745 0,3 %A A258745 _Max Alekseyev_, Jun 08 2015