A187728 Number of (n+1)X9 binary arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors

31672, 758077, 20085335, 603313744, 17862966996, 539993233442, 16272953514081, 491415809239410, 14834567892263310, 447914817916999238, 13523383455137330541, 408310937632489730609, 12328003510777120406346

Offset

1,1

Comments

Column 8 of A187729

Links

R. H. Hardin, Table of n, a(n) for n = 1..84

Example

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

Crossrefs

Sequence in context: A192102 A322123 A236062 * A154471 A184206 A193742

Adjacent sequences: A187725 A187726 A187727 * A187729 A187730 A187731

Keyword

nonn

Author

R. H. Hardin Mar 13 2011

Status

approved