A186618 Number of (n+5)X13 binary arrays with every 6X6 subblock commuting with each horizontal and vertical neighbor 6X6 subblock

71051374, 1448220, 1965243, 3211547, 4814107, 6088635, 6908987, 7083459, 7094123, 7105051, 7118703, 7144519, 7236451, 7671567, 8852923, 10601915, 12550863, 15879079, 21192483, 26939447, 33443315, 42291988, 51354269, 61821634

Offset

1,1

Comments

Column 8 of A186619

Links

R. H. Hardin, Table of n, a(n) for n = 1..30

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>25

Example

Some solutions for 7X13
..0..0..0..0..0..0..0..0..0..0..1..1..1
..0..0..0..0..0..0..0..0..0..0..1..1..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..1..0..1..0..0..0..0..0..0..0..0..0
..0..1..0..0..0..0..0..0..0..0..0..0..0

Crossrefs

Sequence in context: A172608 A294989 A204405 * A186597 A216008 A237075

Adjacent sequences: A186615 A186616 A186617 * A186619 A186620 A186621

Keyword

nonn

Author

R. H. Hardin Feb 24 2011

Status

approved