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A184781 Number of (n+2)X4 0..2 arrays with each 3X3 subblock nonsingular 1
260268, 13313404, 681288932, 34797264276, 1778231844136, 90873049503556, 4643641622051596, 237295567539569352, 12126082907249375676, 619655984740726276728, 31665112274179396900624, 1618122571180552272792264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A184784

LINKS

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

EXAMPLE

Some solutions for 6X4

..0..1..0..0....0..1..0..0....0..1..0..0....0..1..0..0....0..1..0..0

..1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1....1..0..0..1

..0..0..1..0....0..0..1..0....0..0..1..0....0..0..1..0....0..0..1..0

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

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

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

CROSSREFS

Sequence in context: A153980 A317747 A252445 * A146897 A249836 A226111

Adjacent sequences:  A184778 A184779 A184780 * A184782 A184783 A184784

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2011

STATUS

approved

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Last modified May 11 03:49 EDT 2021. Contains 343784 sequences. (Running on oeis4.)