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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
OFFSET
1,3
COMMENTS
Row 4 of A221388
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 14 2013
STATUS
approved