A284078 Number of 4Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements.

0, 0, 314, 7302, 147864, 2696970, 45973823, 754541156, 11967618472, 185031284250, 2806789996272, 41897592713742, 617056516191321, 8986059093265166, 129599934394187822, 1853438708093687988, 26311359259223459474

Offset

1,3

Comments

Row 4 of A284075.

Links

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

R. H. Hardin, Empirical recurrence of order 84

Formula

Empirical recurrence of order 84 (see link above)

Example

Some solutions for n=4
..0..1..1..0. .1..0..0..0. .1..1..0..0. .0..1..1..1. .0..0..0..1
..1..1..1..1. .0..0..0..0. .0..1..1..1. .1..0..1..0. .1..1..0..1
..1..0..1..0. .1..1..1..0. .1..1..0..1. .0..1..1..1. .1..1..1..0
..0..1..1..1. .1..1..1..0. .1..0..1..1. .1..0..1..1. .0..0..1..1

Crossrefs

Cf. A284075.

Sequence in context: A230945 A377769 A183691 * A231021 A104819 A283901

Adjacent sequences: A284075 A284076 A284077 * A284079 A284080 A284081

Keyword

nonn

Author

R. H. Hardin, Mar 19 2017

Status

approved