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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.

A221123 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.

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%I A221123 #5 Jul 23 2025 01:44:17
%S A221123 55,19005,6405243,2152770692,723234356389,242959402596630,
%T A221123 81617731119238274,27417937131776836980,9210537138678339648264,
%U A221123 3094105581109088805200095,1039406189945536764054814983
%N A221123 Number of nX5 arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor.
%C A221123 Column 5 of A221125
%e A221123 Some solutions for n=3
%e A221123 ..0..1..1..2..0....0..1..3..0..0....0..1..2..1..0....0..1..3..1..0
%e A221123 ..0..3..0..4..1....0..3..0..1..1....0..3..0..1..0....0..4..1..2..1
%e A221123 ..0..1..0..1..1....0..3..1..2..0....0..4..2..1..0....0..0..0..1..1
%K A221123 nonn
%O A221123 1,1
%A A221123 _R. H. Hardin_ Jan 02 2013

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