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A283787
Number of 4Xn 0..1 arrays with no 1 equal to more than two of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.
1
0, 6, 745, 10910, 169426, 2343698, 30330979, 378503754, 4556569689, 53546828856, 616835993268, 6986404201564, 78056748854477, 861930295108488, 9421882830360686, 102095122727276740, 1097818076307591942
OFFSET
1,2
COMMENTS
Row 4 of A283784.
FORMULA
Empirical recurrence of order 69 (see link above)
EXAMPLE
Some solutions for n=4
..1..1..0..0. .1..1..1..0. .0..1..0..0. .1..0..1..0. .0..0..1..1
..1..1..1..0. .0..1..0..1. .0..0..1..1. .1..1..0..0. .0..1..1..0
..0..0..1..0. .1..0..0..1. .0..1..1..0. .1..1..0..1. .1..0..0..1
..0..0..1..1. .1..0..1..1. .1..0..1..0. .0..0..1..0. .1..0..1..1
CROSSREFS
Cf. A283784.
Sequence in context: A232130 A289365 A251810 * A130688 A214009 A332176
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 16 2017
STATUS
approved