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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.

A221923 Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.

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%I A221923 #5 Jul 23 2025 02:19:39
%S A221923 6,350,13228,508281,19513309,749481703,28788205897,1105748138634,
%T A221923 42471447510183,1631315682219574
%N A221923 Number of nX3 arrays of occupancy after each element stays put or moves to some king-move neighbor, without move-in move-out straight through or left turns.
%C A221923 Column 3 of A221925
%e A221923 Some solutions for n=3
%e A221923 ..0..0..2....1..1..2....0..0..1....2..0..2....0..1..1....2..0..0....0..2..1
%e A221923 ..2..1..2....0..0..0....3..2..0....2..0..0....5..0..0....3..2..0....2..1..1
%e A221923 ..1..0..1....4..0..1....0..1..2....0..2..1....0..2..0....0..2..0....1..1..0
%K A221923 nonn
%O A221923 1,1
%A A221923 _R. H. Hardin_ Jan 31 2013

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