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A304127
Number of n X n 0..1 arrays with every element unequal to 0, 1, 3 or 6 king-move adjacent elements, with upper left element zero.
0
1, 5, 9, 44, 176, 651, 2945, 14708, 79188, 495071, 3628565, 29134749, 265855219, 2732640025, 30998016185, 398665350465
OFFSET
1,2
COMMENTS
Diagonal of A304133.
EXAMPLE
Some solutions for n=5
..0..1..1..1..0. .0..1..1..0..0. .0..0..0..0..0. .0..1..1..1..0
..1..1..1..1..1. .1..1..1..1..0. .0..0..0..0..1. .1..1..1..1..1
..1..1..1..0..0. .1..1..1..1..1. .0..0..0..1..1. .1..1..1..1..1
..1..1..1..1..0. .0..1..1..1..1. .0..0..0..0..0. .0..1..1..1..1
..1..1..1..1..1. .0..0..1..1..0. .1..0..0..0..1. .0..0..1..1..0
CROSSREFS
Cf. A304133.
Sequence in context: A123822 A226065 A321718 * A220518 A145031 A121724
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 07 2018
STATUS
approved