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A220941
Number of n X 4 arrays of occupancy after each element moves to some horizontal, vertical or antidiagonal neighbor.
1
4, 2056, 291080, 43253705, 6388528170, 944223520057, 139549646254609, 20624731224928936, 3048237966941788465, 450515041275014945368, 66583978433834919848004, 9840795003881912664407189
OFFSET
1,1
COMMENTS
Column 4 of A220943.
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..1....0..0..0..0....0..2..1..0....0..2..0..3....0..0..0..0
..2..1..1..4....2..4..1..2....0..2..0..0....0..3..1..1....1..5..2..1
..0..1..1..0....1..2..0..0....1..3..3..0....1..1..0..0....0..2..1..0
CROSSREFS
Cf. A220943.
Sequence in context: A004815 A198907 A207863 * A012869 A172941 A180993
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 25 2012
STATUS
approved