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A269136
Number of n X n 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three no more than once.
0
4, 148, 18556, 8317996, 14197016484, 95884587957284, 2621894498331024092, 294433751149574057834796, 137064853562490916405823252564, 266206369700280385363973380215109284
OFFSET
1,1
COMMENTS
Diagonal of A269143.
EXAMPLE
Some solutions for n=3
..2..2..3. .0..0..2. .2..1..1. .2..3..2. .0..0..1. .3..1..3. .0..1..3
..3..2..3. .0..2..2. .0..0..1. .3..2..2. .1..1..3. .3..1..3. .3..1..3
..3..2..2. .0..0..1. .1..1..1. .3..2..2. .0..2..2. .3..2..3. .1..3..1
CROSSREFS
Cf. A269143.
Sequence in context: A180375 A160470 A350985 * A226073 A366218 A361774
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 20 2016
STATUS
approved