login
A304545
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 6 king-move adjacent elements, with upper left element zero.
0
1, 4, 13, 418, 16782, 1368963, 274090332, 104360036860, 78307988484284
OFFSET
1,2
COMMENTS
Diagonal of A304551.
EXAMPLE
Some solutions for n=5
..0..0..1..1..0. .0..1..1..0..1. .0..1..1..0..1. .0..1..0..1..0
..1..1..1..0..1. .0..1..1..0..0. .0..1..0..1..0. .1..1..1..0..1
..0..1..0..0..0. .0..1..1..1..1. .1..1..1..0..1. .0..0..1..1..1
..1..0..1..0..1. .0..0..1..0..0. .0..1..1..0..0. .0..0..0..1..0
..1..0..0..1..0. .1..1..1..0..1. .1..0..1..1..1. .1..1..0..0..1
CROSSREFS
Cf. A304551.
Sequence in context: A219822 A048558 A219571 * A316372 A306130 A317267
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 14 2018
STATUS
approved