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.

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.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 69

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

Adjacent sequences: A283784 A283785 A283786 * A283788 A283789 A283790

Keyword

nonn

Author

R. H. Hardin, Mar 16 2017

Status

approved