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A187728 Number of (n+1)X9 binary arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors 1
31672, 758077, 20085335, 603313744, 17862966996, 539993233442, 16272953514081, 491415809239410, 14834567892263310, 447914817916999238, 13523383455137330541, 408310937632489730609, 12328003510777120406346 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 26 04:47 EST 2020. Contains 332276 sequences. (Running on oeis4.)