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A283382
Number of nX4 0..1 arrays with no 1 equal to more than two of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly two elements.
1
0, 19, 532, 8087, 116624, 1592250, 20788531, 264040297, 3282238215, 40118887549, 483764807520, 5768246109027, 68131353675622, 798246637065836, 9287150583313283, 107389081231009891, 1235032262230121990
OFFSET
1,2
COMMENTS
Column 4 of A283386.
FORMULA
Empirical recurrence of order 57 (see link above)
EXAMPLE
Some solutions for n=4
..0..0..1..1. .1..0..1..1. .0..0..1..0. .0..1..1..1. .1..1..0..1
..0..1..0..1. .1..0..1..0. .1..1..1..1. .0..1..0..0. .0..0..0..1
..1..0..1..1. .1..1..0..1. .0..1..0..0. .1..0..1..1. .1..1..1..0
..1..0..0..1. .0..1..0..0. .0..0..0..0. .1..1..0..0. .0..1..0..1
CROSSREFS
Cf. A283386.
Sequence in context: A158583 A009081 A057644 * A196512 A027406 A053116
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 06 2017
STATUS
approved