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A299222
Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
0
0, 4, 113, 5663, 766094, 281251424, 260938102438, 624662873923282, 3865535525302817693
OFFSET
1,2
COMMENTS
Diagonal of A299228.
EXAMPLE
Some solutions for n=5
..0..0..0..0..1. .0..0..1..0..0. .0..0..1..0..0. .0..0..0..1..0
..0..1..0..0..1. .0..1..0..0..1. .0..1..0..0..1. .0..1..1..1..0
..1..0..0..0..0. .1..1..1..0..1. .1..0..1..1..0. .1..0..0..0..1
..0..1..1..1..1. .0..1..0..1..0. .0..1..0..0..1. .0..1..0..0..1
..0..1..1..0..0. .1..0..0..0..1. .1..0..0..1..0. .0..0..0..0..0
CROSSREFS
Cf. A299228.
Sequence in context: A103499 A298331 A299394 * A300036 A199834 A194495
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2018
STATUS
approved