login
A283566
Number of n X n 0..1 arrays with no 1 equal to more than one of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element.
0
0, 4, 169, 6812, 945100, 226897932, 129997769458, 172466774677716, 522509795096193625, 3748613500011644923440, 62982260120608888164984371
OFFSET
1,2
COMMENTS
Diagonal of A283572.
EXAMPLE
Some solutions for n=4
..1..1..1..0. .0..1..0..1. .1..0..0..0. .0..1..0..0. .1..0..1..0
..1..0..0..0. .0..1..0..1. .0..0..0..0. .1..0..1..0. .1..0..1..0
..1..0..1..1. .0..0..1..0. .0..1..0..0. .1..0..1..0. .1..0..1..0
..0..0..0..0. .0..1..0..0. .1..1..0..0. .0..0..1..0. .0..1..0..0
CROSSREFS
Cf. A283572.
Sequence in context: A177005 A017414 A051476 * A221083 A355883 A181191
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2017
STATUS
approved