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A305580
Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 4, 6, 15, 76, 1897, 50618, 1944635, 206386330, 39654762470, 12122540208729, 7706375033488022, 9485494637120246765, 20755111336456755801193
OFFSET
1,2
COMMENTS
Diagonal of A305586.
EXAMPLE
Some solutions for n=5
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0
..0..0..0..0..0. .0..1..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..1..0. .0..1..0..0..0
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .1..0..0..0..0
CROSSREFS
Cf. A305586.
Sequence in context: A294070 A073603 A064910 * A191311 A086714 A356801
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 05 2018
STATUS
approved