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A316926
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 25, 1719, 467377, 504420842, 2110655397816, 33990477458950173, 2097232699194056398870
OFFSET
1,2
COMMENTS
Diagonal of A316932.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..0..0..0..1. .0..0..0..0..1. .0..1..0..1..0
..1..1..1..1..0. .0..0..0..0..1. .1..1..1..0..1. .0..1..0..0..1
..1..1..0..0..1. .1..1..1..1..1. .0..0..1..1..0. .1..0..1..1..0
..1..1..0..1..0. .1..1..0..1..0. .0..0..1..1..0. .0..0..1..0..1
..1..1..0..1..0. .0..0..1..1..0. .0..0..1..0..1. .1..0..1..0..1
CROSSREFS
Cf. A316932.
Sequence in context: A305679 A317061 A144229 * A317699 A284106 A063802
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 16 2018
STATUS
approved