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A298884
Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero.
0
0, 3, 15, 40, 123, 516, 1818, 7768, 41048, 242083, 1483959, 10171555
OFFSET
1,2
COMMENTS
Diagonal of A298888.
EXAMPLE
Some solutions for n=7
..0..1..0..1..0..0..0. .0..1..1..0..0..1..1. .0..0..1..0..0..1..1
..1..0..0..1..1..1..1. .1..0..0..0..0..0..0. .1..0..1..1..1..0..0
..0..0..0..1..1..1..0. .1..0..0..0..1..0..1. .0..1..0..1..0..1..0
..0..0..1..1..1..1..0. .0..0..0..0..1..1..0. .0..1..1..1..1..1..1
..0..1..0..1..1..1..1. .0..0..1..1..0..1..0. .1..0..1..1..1..0..0
..0..0..1..1..0..0..0. .1..0..0..1..1..0..1. .1..0..1..1..1..0..1
..1..1..0..0..1..1..1. .1..0..1..0..0..1..0. .1..0..1..0..0..1..0
CROSSREFS
Cf. A298888.
Sequence in context: A297621 A014309 A298049 * A298655 A299608 A249835
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 28 2018
STATUS
approved