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A305277
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 11, 166, 1185, 26577, 342596, 9804507, 220905716, 9470663034, 400580293516
OFFSET
1,2
COMMENTS
Diagonal of A305281.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..0..1..1..0. .0..1..0..1..1. .0..0..1..0..1
..1..1..1..0..1. .0..0..1..1..0. .1..0..0..0..0. .0..0..1..1..0
..0..1..0..0..0. .0..0..1..1..1. .0..0..0..0..0. .0..0..1..1..0
..1..0..0..0..1. .0..0..1..1..0. .1..0..0..0..0. .0..0..1..1..1
..0..1..1..1..0. .1..1..0..0..1. .0..1..1..1..1. .0..0..1..0..0
CROSSREFS
Cf. A305281.
Sequence in context: A119571 A089920 A303881 * A118197 A092658 A304888
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 29 2018
STATUS
approved