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A275031
Number of n X n 0..2 arrays with no element equal to any value at offset (0,-1), (-1,-2) or (-2,0) and new values introduced in order 0..2.
0
1, 6, 46, 570, 11624, 421793, 26631796, 2976710318, 583268028453, 200678789857876, 121566258532250545, 129693591124665273124, 243968254768827185678164
OFFSET
1,2
COMMENTS
Diagonal of A275037.
EXAMPLE
Some solutions for n=4
..0..1..0..2. .0..1..2..1. .0..1..0..2. .0..1..2..0. .0..1..0..1
..1..2..1..2. .0..2..1..0. .0..2..1..2. .2..0..2..0. .0..2..1..0
..1..0..2..0. .1..0..1..0. .1..0..1..0. .1..2..1..2. .1..0..2..0
..0..1..0..1. .2..1..0..2. .2..1..0..1. .0..1..0..1. .2..1..2..1
CROSSREFS
Cf. A275037.
Sequence in context: A215084 A232058 A331704 * A094655 A327364 A015865
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 14 2016
STATUS
approved