A187435 - OEIS

A187435

Number of (n+1) X 4 0..2 arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.

5344, 311730, 18257013, 1070374436, 62735788524, 3677337022406, 215547981233289, 12634446300216814, 740573387875513027, 43409027745399571245, 2544438765507573177231, 149143369457644414336487

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OFFSET

1,1

COMMENTS

Column 3 of A187441.

LINKS

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

EXAMPLE

Some solutions for 3 X 4

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

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

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

CROSSREFS

Cf. A187441.

Sequence in context: A023342 A050814 A234213 * A023939 A204863 A259893

Adjacent sequences: A187432 A187433 A187434 * A187436 A187437 A187438

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 10 2011

STATUS

approved