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A304842
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 25, 132, 3009, 67025, 1500288, 105482136, 11448808957, 1335761507398, 322003120783835
OFFSET
1,2
COMMENTS
Diagonal of A304848.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..1..0..1. .0..0..1..1..1. .0..1..1..0..1
..0..0..0..0..0. .0..0..0..1..1. .1..1..1..1..1. .0..1..1..0..1
..0..0..0..0..0. .0..0..0..0..1. .1..1..1..1..1. .1..1..1..1..1
..1..0..0..1..0. .0..0..0..1..0. .1..1..1..1..0. .0..1..1..1..0
..1..0..0..1..0. .0..0..0..0..0. .1..1..1..0..1. .0..1..1..0..1
CROSSREFS
Cf. A304848.
Sequence in context: A263440 A240631 A123660 * A156701 A273120 A220381
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 19 2018
STATUS
approved