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A299938
Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.
0
1, 8, 70, 649, 8379, 124748, 2237911, 57942564, 2226744922, 121611666154, 12022143900385
OFFSET
1,2
COMMENTS
Diagonal of A299942.
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..1..1..1..1. .0..0..1..1..1. .0..0..1..1..0
..1..0..1..1..0. .0..0..0..1..0. .0..1..0..0..0. .0..1..0..1..0
..0..0..0..0..0. .1..1..1..1..1. .1..0..1..1..1. .0..1..0..1..0
..1..1..1..1..1. .1..0..0..0..0. .1..0..1..0..0. .0..1..0..1..1
..0..0..1..0..0. .0..1..1..0..1. .1..0..0..1..0. .1..0..1..0..0
CROSSREFS
Cf. A299942.
Sequence in context: A298281 A299355 A299175 * A152263 A142986 A123511
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 22 2018
STATUS
approved