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A203538 Number of nX4 0..2 arrays with every element neighboring horizontally or vertically both a 0 and a 1 1
0, 16, 144, 3364, 30976, 614656, 8479744, 129504400, 1978826256, 29961532836, 454089995044, 6895434839056, 104626058201344, 1587468792674704, 24091008317030656, 365573436678862864, 5547427717263648804 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A203542

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A155663 A077485 A131705 * A076029 A196572 A052388

Adjacent sequences:  A203535 A203536 A203537 * A203539 A203540 A203541

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 02 2012

STATUS

approved

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Last modified January 18 00:33 EST 2022. Contains 350410 sequences. (Running on oeis4.)