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A274744
Number of n X n 0..2 arrays with no element equal to any value at offset (-1,-2), (0,-1) or (-1,0) and new values introduced in order 0..2.
0
1, 3, 34, 813, 40242, 4190533, 920432562, 427529873959, 420708712370442, 878018029249193808, 3889681900917706414509, 36599212212994279601355491, 731787586726658710118188021426
OFFSET
1,2
COMMENTS
Diagonal of A274749.
EXAMPLE
Some solutions for n=4
..0..1..2..0. .0..1..0..1. .0..1..0..2. .0..1..0..2. .0..1..0..1
..1..2..1..2. .1..0..1..0. .2..0..2..0. .1..0..1..0. .2..0..1..0
..0..1..0..1. .0..1..0..2. .1..2..1..2. .0..1..0..1. .0..1..0..1
..2..0..1..2. .1..0..1..0. .2..0..2..1. .2..0..1..0. .1..2..1..0
CROSSREFS
Cf. A274749.
Sequence in context: A277391 A231850 A109521 * A222869 A069718 A077144
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 04 2016
STATUS
approved