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A305912
Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 5, 13, 101, 2014, 61467, 18643274, 12581159370, 17019760656259
OFFSET
1,2
COMMENTS
Diagonal of A305918.
EXAMPLE
Some solutions for n=5
..0..1..0..0..0. .0..0..1..0..1. .0..1..1..1..1. .0..0..0..1..1
..0..0..0..0..0. .0..1..1..0..0. .1..1..1..1..0. .0..0..1..1..1
..0..0..0..0..0. .1..1..1..0..0. .0..0..0..0..1. .0..1..1..1..1
..0..0..0..0..0. .0..0..0..1..0. .1..0..0..0..0. .1..1..1..1..1
..1..0..0..0..0. .1..0..0..0..0. .0..0..0..0..0. .1..1..1..1..0
CROSSREFS
Cf. A305918.
Sequence in context: A337749 A117340 A304348 * A180827 A117437 A179089
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 14 2018
STATUS
approved