A186614 Number of (n+5)X9 binary arrays with every 6X6 subblock commuting with each horizontal and vertical neighbor 6X6 subblock

654700, 25852, 30997, 88336, 439891, 1478651, 2676699, 3211547, 3276255, 3284387, 3291623, 3298867, 3306139, 3313675, 3324899, 3352139, 3475367, 4273524, 6521085, 9738958, 13025227, 16335644, 19749285, 23845099, 29397589, 35927927, 42537885

Offset

1,1

Comments

Column 4 of A186619

Links

R. H. Hardin, Table of n, a(n) for n = 1..62

Formula

Empirical: a(n)=a(n-1)+a(n-4)-a(n-5)+a(n-6)-a(n-7)-a(n-10)+a(n-11)+a(n-12)-a(n-16) for n>23

Example

Some solutions for 7X9
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..1..0..1..0
..0..0..0..0..0..0..0..1..1....0..0..0..0..0..0..0..0..0
..1..0..0..0..0..0..1..1..1....0..0..0..0..0..0..0..0..1
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0

Crossrefs

Sequence in context: A162892 A232675 A321064 * A251279 A205941 A365024

Adjacent sequences: A186611 A186612 A186613 * A186615 A186616 A186617

Keyword

nonn

Author

R. H. Hardin Feb 24 2011

Status

approved