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A298281
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.
0
1, 8, 70, 649, 8264, 121368, 2195114, 55665676, 2065512284, 105764508137, 7817598459732, 873942008386780, 140850901178992246
OFFSET
1,2
COMMENTS
Diagonal of A298287.
EXAMPLE
Some solutions for n=6
..0..1..0..1..0..0. .0..1..0..0..1..1. .0..1..0..1..1..0. .0..1..1..0..0..1
..0..1..0..1..0..1. .0..1..0..1..0..0. .0..1..0..0..0..0. .1..0..1..1..1..0
..0..0..0..1..1..1. .0..1..0..1..1..1. .1..0..1..1..1..1. .1..0..0..0..0..0
..0..1..0..1..0..1. .0..1..0..0..0..0. .1..0..1..0..0..1. .0..1..1..1..1..1
..1..1..0..1..0..1. .1..0..1..1..1..1. .1..0..1..0..1..0. .0..0..1..0..0..0
..0..1..0..0..1..1. .1..1..0..0..0..0. .0..1..1..0..1..0. .0..1..1..1..0..1
CROSSREFS
Cf. A298287.
Sequence in context: A056631 A190560 A266361 * A299355 A299175 A299938
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 16 2018
STATUS
approved