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A269090
Number of n X n 0..3 arrays with some element plus some horizontally or vertically adjacent neighbor totalling three exactly once.
1
0, 96, 31296, 37963968, 211625837280, 5826856525990272, 819944297332124826720, 600994567853371717147309536, 2321584677123190401202986846749664, 47631920426007575412576023256743509016160
OFFSET
1,2
COMMENTS
Diagonal of A269097.
LINKS
EXAMPLE
Some solutions for n=3
..2..1..1. .1..3..2. .2..3..3. .2..3..3. .0..0..0. .2..0..1. .3..3..2
..0..1..0. .3..3..3. .3..3..1. .0..1..1. .1..0..2. .3..2..2. .2..3..2
..0..1..1. .1..2..2. .2..2..2. .1..0..3. .1..2..3. .3..3..3. .1..3..2
CROSSREFS
Cf. A269097.
Sequence in context: A208794 A276099 A233161 * A232522 A296061 A340396
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 19 2016
STATUS
approved