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A269894
Number of n X n 0..6 arrays with some element plus some horizontally or vertically adjacent neighbor totalling six exactly once.
0
0, 840, 12377400, 3263186052840, 19179756370570398120, 2711366026130939117933480040, 9555836762886245973504760743477970440
OFFSET
1,2
COMMENTS
Diagonal of A269902.
EXAMPLE
Some solutions for n=2
..0..6. .6..6. .6..1. .2..0. .0..5. .4..1. .3..3. .1..3. .0..6. .5..5
..3..4. .1..5. .3..5. .6..6. .0..6. .4..5. .1..1. .5..5. .5..4. .1..0
CROSSREFS
Cf. A269902.
Sequence in context: A331650 A331652 A364179 * A252780 A364264 A362440
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 07 2016
STATUS
approved