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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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A221723. LINKS R. H. Hardin, Table of n, a(n) for n = 1..13 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: A078395 A340331 A202980 * A153833 A221164 A264250 Adjacent sequences:  A221719 A221720 A221721 * A221723 A221724 A221725 KEYWORD nonn AUTHOR R. H. Hardin, Jan 22 2013 STATUS approved

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Last modified June 26 00:12 EDT 2022. Contains 354870 sequences. (Running on oeis4.)