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A198602 Number of 2nX12 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 0
41, 15761, 6671450, 2934981667, 1308245895665 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A198604

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=2

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

..0..1..1..2..2..0..1..1..0..0..1..1....0..0..1..1..0..0..2..3..3..1..1..2

..0..1..1..2..2..0..3..3..2..2..0..0....1..1..2..2..3..3..2..3..3..1..1..2

..0..0..0..0..0..0..3..3..2..2..0..0....1..1..2..2..3..3..2..2..2..2..2..2

CROSSREFS

Sequence in context: A289416 A199255 A199200 * A214338 A084275 A218377

Adjacent sequences:  A198599 A198600 A198601 * A198603 A198604 A198605

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 27 2011

STATUS

approved

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Last modified April 7 11:07 EDT 2020. Contains 333301 sequences. (Running on oeis4.)