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URL: https://oeis.org/A304473

⇱ A304473 - OEIS

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A304473
Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero.
0
1, 4, 19, 110, 931, 11079, 132348, 2942145, 77098563, 2797159164
OFFSET
1,2
COMMENTS
Diagonal of A304479.
EXAMPLE
Some solutions for n=5
..0..0..1..0..1. .0..0..0..0..0. .0..0..1..1..1. .0..1..1..1..0
..0..0..1..0..1. .0..0..0..0..0. .0..1..0..1..1. .0..1..1..1..0
..0..0..0..1..1. .0..0..0..0..1. .1..0..0..0..0. .1..1..1..0..0
..0..0..0..0..1. .1..1..0..1..0. .1..1..0..1..1. .1..1..0..1..0
..1..1..0..0..1. .1..1..1..0..0. .1..0..1..1..1. .1..1..0..1..0
CROSSREFS
Cf. A304479.
Sequence in context: A004212 A243241 A060905 * A394879 A174123 A127548
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 13 2018
STATUS
approved