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 A356837 #14 Nov 06 2022 09:03:40
%S A356837 1,20,260,3212,39470,484760,5953532,73117640,897985850,11028509072,
%T A356837 135445355180,1663456422080,20429547136382,250903113935780,
%U A356837 3081437496506420,37844317258279532,464780593592780450,5708148959489987900,70103969470537620692,860973771077827270580
%N A356837 Coordination sequence of the {3,5,3} hyperbolic honeycomb.
%C A356837 a(n) is the number of cells n steps from an (arbitrarily chosen) central cell in the {3,5,3} honeycomb.
%H A356837 Dorota Celińska-Kopczyńska and Eryk Kopczyński, <a href="https://arxiv.org/abs/2208.13816">Generating Regular Hyperbolic Honeycombs</a>, arXiv:2208.13816 [cs.CG], 2022.
%e A356837 Each icosahedral cell has 20 neighbors, so a(1) = 20.
%K A356837 nonn
%O A356837 0,2
%A A356837 _Eryk Kopczynski_, Aug 31 2022