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A187440 Number of (n+1)X9 0..2 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors 0
206705746, 1606497082565, 12634446300216814, 99822247953081225350, 787665007015732116012615 (list; graph; refs; listen; history; text; internal format)
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

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Last modified July 30 02:36 EDT 2021. Contains 346346 sequences. (Running on oeis4.)