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A298835
Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.
0
0, 1, 9, 110, 18075, 5918418, 7844725524, 33608679844048, 476321271854010112
OFFSET
1,3
COMMENTS
Diagonal of A298841.
EXAMPLE
Some solutions for n=5
..0..0..1..1..1. .0..0..0..0..0. .0..0..0..1..1. .0..0..0..1..1
..0..0..1..1..1. .0..0..0..0..0. .0..0..0..1..0. .0..0..0..1..1
..1..0..1..1..1. .0..0..0..0..0. .1..1..1..0..0. .0..0..0..1..1
..1..1..0..0..0. .0..0..0..0..0. .1..1..1..0..0. .1..1..1..0..1
..1..0..0..0..0. .0..0..0..0..0. .1..1..1..0..0. .1..1..1..0..0
CROSSREFS
Cf. A298841.
Sequence in context: A053894 A053904 A058607 * A082723 A352384 A143167
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 27 2018
STATUS
approved