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 A095239 #10 Apr 12 2023 11:17:53 %S A095239 1,2,6,8,40,96,168,384,1728,15360,50688,221184,299520,1290240,3628800, %T A095239 30965760,65802240,743178240,7060193280,237817036800,624269721600, %U A095239 5231974809600,28716407193600,479439146188800 %N A095239 Analog of A095236 when the phones are arranged in a circle. %H A095239 Max Alekseyev, <a href="/A095239/b095239.txt">Table of n, a(n) for n = 1..100</a> %H A095239 Max A. Alekseyev, <a href="https://arxiv.org/abs/2304.04324">Enumeration of Payphone Permutations</a>, arXiv:2304.04324 [math.CO], 2023. %Y A095239 Cf. A095236, A095240. %K A095239 nonn %O A095239 1,2 %A A095239 _Neil Fernandez_, Jul 03 2004 %E A095239 Corrected and extended by _Don Reble_, Jul 04 2004