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 A221940 Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns 1

%I

%S 1,489,24535,1759041,119035112,8118923949,552777330287,37650441405451,

%T 2564181255574899,174635497977344862,11893675692936218866,

%U 810026663520753630706,55167419097633745309553,3757214394165203187203557

%N Number of 4Xn arrays of occupancy after each element stays put or moves to some horizontal or antidiagonal neighbor, without move-in move-out straight through or left turns

%C Row 4 of A221937

%H R. H. Hardin, <a href="/A221940/b221940.txt">Table of n, a(n) for n = 1..24</a>

%e Some solutions for n=3

%e ..1..3..0....0..1..1....2..0..1....1..0..1....0..1..1....0..1..0....1..1..0

%e ..0..0..1....3..0..1....1..0..0....1..3..0....3..0..1....2..3..0....1..4..0

%e ..1..2..0....0..2..0....2..3..0....0..1..1....1..1..3....1..1..2....0..2..0

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 01 2013

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Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)