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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.

A217270 Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor.

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%I A217270 #6 Jul 22 2025 23:38:54
%S A217270 8,3025,772800,194881600,48909857500,12276607432401,3080781263731464,
%T A217270 773143936621737444,194021789111058265560,48690338552261542133284,
%U A217270 12218954146290231642146852,3066376844585908891388914564
%N A217270 Number of nX5 arrays of occupancy after each element moves to some horizontal or vertical neighbor.
%C A217270 Column 5 of A217273
%H A217270 R. H. Hardin, <a href="/A217270/b217270.txt">Table of n, a(n) for n = 1..20</a>
%e A217270 Some solutions for n=3
%e A217270 ..1..1..0..1..0....1..0..0..1..0....0..1..0..1..0....1..0..0..0..0
%e A217270 ..0..1..2..2..0....2..1..4..2..0....1..3..2..3..1....2..1..1..4..3
%e A217270 ..1..2..0..2..2....0..0..2..1..1....0..0..0..2..1....0..1..1..1..0
%K A217270 nonn
%O A217270 1,1
%A A217270 _R. H. Hardin_ Sep 29 2012

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