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A265462
Number of nX4 0..n+4-2 arrays with upper left zero and lower right n+4-2 and each element differing from its horizontal and antidiagonal neighbors by one or two.
1
2, 139, 8812, 398508, 22533687, 1509143496, 90139418667, 5406371366046, 345027685293581, 21781937201310642, 1364248599882667154, 86845415914930878736, 5551683807912172844571, 354345805660601775721536
OFFSET
1,1
COMMENTS
Column 4 of A265466.
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..1....0..1..3..5....0..1..2..0....0..1..2..4....0..2..0..2
..2..1..0..2....3..2..3..5....3..1..2..1....0..1..3..2....0..2..4..5
..0..2..3..5....3..5..4..5....3..4..3..5....0..1..3..5....3..2..3..5
CROSSREFS
Cf. A265466.
Sequence in context: A084560 A054681 A152509 * A094482 A265176 A101232
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 09 2015
STATUS
approved