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A221390 Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2 1

%I

%S 0,0,13,1198,52320,2204556,86673898,3361458245,128992693561,

%T 4928816080380,187851827622672,7150418585672281,271982464009887803,

%U 10341601574159713990,393139667142067892978,14943725056237306101598

%N Number of 4Xn arrays of occupancy after each element moves to some horizontal or antidiagonal neighbor, with no 2-loops and with no occupancy greater than 2

%C Row 4 of A221388

%H R. H. Hardin, <a href="/A221390/b221390.txt">Table of n, a(n) for n = 1..21</a>

%e Some solutions for n=3

%e ..0..2..1....0..2..1....0..2..1....0..2..1....0..2..0....0..2..1....0..2..0

%e ..0..2..1....0..2..1....0..2..0....1..2..1....1..2..1....1..2..1....1..2..1

%e ..1..2..1....1..2..0....1..2..1....0..2..1....1..2..1....0..2..0....0..2..1

%e ..0..2..0....1..2..0....1..2..0....0..2..0....0..2..0....1..2..0....1..2..0

%K nonn

%O 1,3

%A _R. H. Hardin_ Jan 14 2013

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Last modified May 26 21:56 EDT 2022. Contains 354092 sequences. (Running on oeis4.)