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A283570
Number of nX6 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.
1
12, 908, 21186, 509952, 10919674, 226897932, 4558585174, 89724600000, 1736716820366, 33188681249924, 627668838247742, 11769603893466432, 219120313902873796, 4054721455598417092, 74638990577755174088
OFFSET
1,1
COMMENTS
Column 6 of A283572.
FORMULA
Empirical recurrence of order 54 (see link above)
EXAMPLE
Some solutions for n=3
..0..1..0..0..0..0. .0..0..0..1..1..0. .1..0..1..1..1..0. .1..0..0..1..1..0
..0..1..1..0..0..0. .0..0..0..0..0..0. .0..0..0..0..0..0. .1..0..0..0..0..0
..0..1..0..0..0..0. .1..1..1..0..0..1. .1..1..0..0..1..1. .1..0..1..1..1..0
CROSSREFS
Cf. A283572.
Sequence in context: A116225 A214313 A306642 * A159870 A283040 A229603
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2017
STATUS
approved