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A221722
Number of n X 4 arrays of occupancy after each element stays put or moves to some horizontal, diagonal or antidiagonal neighbor.
1
21, 3605, 544757, 81980587, 12325049264, 1852447247829, 278394265759168, 41836968289680535, 6287169859547251975, 944818763789937611918, 141984605326159531366196, 21337022505681038084244109
OFFSET
1,1
COMMENTS
Column 4 of A221723.
LINKS
EXAMPLE
Some solutions for n=3
..0..0..0..1....0..0..0..2....0..1..2..1....0..3..1..1....0..0..0..1
..0..1..1..2....0..4..1..1....0..4..0..0....0..1..0..1....0..4..2..2
..0..2..5..0....0..3..0..1....0..1..1..2....0..2..0..3....2..0..0..1
CROSSREFS
Cf. A221723.
Sequence in context: A340331 A370085 A202980 * A153833 A221164 A264250
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 22 2013
STATUS
approved