A187440 Number of (n+1)X9 0..2 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

206705746, 1606497082565, 12634446300216814, 99822247953081225350, 787665007015732116012615

Offset

1,1

Comments

Column 8 of A187441

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3X9
..0..1..0..1..0..2..0..1..2....0..1..0..1..0..1..0..2..0
..0..0..0..0..0..1..1..1..2....0..0..0..0..0..1..2..1..1
..0..1..0..1..0..0..2..1..0....0..1..0..1..0..2..0..1..2

Crossrefs

Sequence in context: A034641 A288088 A233493 * A092379 A233614 A105294

Adjacent sequences: A187437 A187438 A187439 * A187441 A187442 A187443

Keyword

nonn

Author

R. H. Hardin Mar 10 2011

Status

approved