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A298214
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.
0
1, 7, 20, 120, 2066, 25717, 1261845, 72407248, 7205019743, 1633990811314
OFFSET
1,2
COMMENTS
Diagonal of A298221.
EXAMPLE
Some solutions for n=6
..0..0..1..0..1..1. .0..1..0..1..0..1. .0..1..0..1..1..1. .0..1..1..1..1..0
..1..0..1..0..0..0. .0..0..1..0..1..1. .0..0..1..1..1..0. .1..0..0..0..0..1
..0..1..0..0..1..0. .1..1..0..1..0..0. .1..1..0..0..1..0. .0..0..1..0..0..1
..1..0..1..0..0..0. .0..0..0..0..0..1. .0..0..0..1..1..0. .0..0..1..1..1..0
..0..1..0..0..1..1. .0..1..0..1..1..0. .1..0..0..1..1..1. .1..0..1..1..0..1
..1..0..1..1..0..0. .1..1..0..1..0..1. .0..1..1..0..0..0. .1..0..0..1..0..1
CROSSREFS
Cf. A298221.
Sequence in context: A299181 A299944 A265657 * A299346 A009370 A299091
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 15 2018
STATUS
approved