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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.

A217271 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor.

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%I A217271 #6 Jul 22 2025 23:39:00
%S A217271 16,20736,17640000,14755689729,12276607432401,10211121295308649,
%T A217271 8491624540729737796,7061648944253957079481,5872435140472364430803929,
%U A217271 4883489824271582246264899984,4061085890163124328387958867561
%N A217271 Number of nX6 arrays of occupancy after each element moves to some horizontal or vertical neighbor.
%C A217271 Column 6 of A217273
%H A217271 R. H. Hardin, <a href="/A217271/b217271.txt">Table of n, a(n) for n = 1..15</a>
%e A217271 Some solutions for n=3
%e A217271 ..0..1..1..0..0..0....0..1..1..1..3..0....0..1..0..0..1..1....0..1..1..1..3..2
%e A217271 ..0..0..4..4..1..2....0..1..1..1..2..0....0..1..2..1..1..3....0..1..1..1..1..0
%e A217271 ..2..1..0..1..0..1....0..1..1..1..2..2....2..1..0..1..1..2....0..1..1..1..2..1
%K A217271 nonn
%O A217271 1,1
%A A217271 _R. H. Hardin_ Sep 29 2012

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