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A305476
Number of nXn 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.
0
1, 5, 10, 48, 277, 1558, 11438, 123104, 1894686, 36262397, 960587975, 37710956242, 1964623266399, 139733367823273
OFFSET
1,2
COMMENTS
Diagonal of A305482.
EXAMPLE
Some solutions for n=5
..0..1..1..1..1. .0..1..1..1..1. .0..0..0..0..1. .0..0..0..0..0
..1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0. .0..0..0..0..0
..1..1..1..1..1. .1..1..1..1..1. .1..0..0..0..0. .0..0..0..1..0
..1..1..1..1..1. .1..1..1..1..0. .1..1..0..0..0. .0..0..0..0..0
..0..1..1..1..0. .1..1..1..0..0. .1..1..1..0..0. .1..0..0..0..0
CROSSREFS
Cf. A305482.
Sequence in context: A103932 A034190 A216390 * A270089 A336582 A271275
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 02 2018
STATUS
approved