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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
 0, 0, 13, 1198, 52320, 2204556, 86673898, 3361458245, 128992693561, 4928816080380, 187851827622672, 7150418585672281, 271982464009887803, 10341601574159713990, 393139667142067892978, 14943725056237306101598 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row 4 of A221388 LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for n=3 ..0..2..1....0..2..1....0..2..1....0..2..1....0..2..0....0..2..1....0..2..0 ..0..2..1....0..2..1....0..2..0....1..2..1....1..2..1....1..2..1....1..2..1 ..1..2..1....1..2..0....1..2..1....0..2..1....1..2..1....0..2..0....0..2..1 ..0..2..0....1..2..0....1..2..0....0..2..0....0..2..0....1..2..0....1..2..0 CROSSREFS Sequence in context: A195520 A128897 A201265 * A226095 A220619 A178560 Adjacent sequences:  A221387 A221388 A221389 * A221391 A221392 A221393 KEYWORD nonn AUTHOR R. H. Hardin Jan 14 2013 STATUS approved

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Last modified January 21 17:26 EST 2022. Contains 350479 sequences. (Running on oeis4.)