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A187434 Number of (n+1)X3 0..2 arrays with no 2X2 subblock commuting with any of its horizontal and vertical 2X2 subblock neighbors 1
646, 14178, 311730, 6858445, 150878368, 3319295436, 73023484028, 1606497082565, 35342494847192, 777525229664355, 17105342463962277, 376312857890356814, 8278779993593986684, 182130896536461047078, 4006829931293712863310 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A187441

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for 5X3

..0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0....0..0..0

..0..2..1....0..1..1....2..1..0....0..2..0....1..0..1....2..2..0....2..0..1

..0..2..0....0..1..2....1..1..2....0..0..0....1..2..2....0..1..1....1..0..1

..2..1..0....2..0..2....1..1..2....0..1..0....2..2..0....1..2..2....1..2..0

..0..2..0....0..1..1....2..2..0....2..2..2....1..0..1....1..1..1....0..2..2

CROSSREFS

Sequence in context: A230488 A228575 A250989 * A046020 A108821 A035885

Adjacent sequences:  A187431 A187432 A187433 * A187435 A187436 A187437

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified May 7 16:00 EDT 2021. Contains 343652 sequences. (Running on oeis4.)