A186588 Number of (n+3)X11 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock

2604716, 104983, 160945, 342691, 645937, 841075, 895753, 1049539, 1237105, 1449115, 1727305, 2270035, 3454177, 4842475, 6443497, 8851603, 12917665, 18584859, 25233881, 34582531, 49615377, 70627083, 96804489, 133197363

Offset

1,1

Comments

Column 8 of A186589

Links

R. H. Hardin, Table of n, a(n) for n = 1..59

Formula

Empirical: a(n)=2*a(n-1)-a(n-2)+2*a(n-4)-4*a(n-5)+2*a(n-6)+2*a(n-8)-2*a(n-9) for n>18

Example

Some solutions for 5X11
..0..0..0..0..0..0..0..0..0..2..1....0..0..0..0..0..0..0..0..0..0..0
..0..0..0..0..0..0..0..0..0..1..0....0..0..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..1
..1..0..0..0..0..0..0..0..0..0..0....2..0..0..0..0..0..0..0..0..0..0
..2..0..1..0..0..0..0..0..0..0..0....0..1..0..0..0..0..0..0..0..0..0

Crossrefs

Sequence in context: A317615 A250706 A269281 * A204882 A183660 A004674

Adjacent sequences: A186585 A186586 A186587 * A186589 A186590 A186591

Keyword

nonn

Author

R. H. Hardin Feb 24 2011

Status

approved