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A198251 Number of 2nX12 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 0
51, 90641, 203087097, 468268681671, 1088857594220452 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A198253

LINKS

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

EXAMPLE

Some solutions for n=3

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

..0..2..2..3..3..4..4..1..1..0..1..1....0..2..2..3..3..0..1..1..0..0..1..1

..0..2..2..3..3..4..4..1..1..0..0..0....0..2..2..3..3..0..3..3..1..1..2..2

..0..4..4..0..0..0..0..0..0..4..4..0....0..0..0..0..0..0..3..3..1..1..2..2

..0..4..4..0..1..1..4..4..0..4..4..0....2..2..4..4..3..3..1..1..2..2..0..0

..0..0..0..0..1..1..4..4..0..0..0..0....2..2..4..4..3..3..1..1..2..2..0..0

CROSSREFS

Sequence in context: A208412 A198904 A238567 * A135531 A038777 A281979

Adjacent sequences:  A198248 A198249 A198250 * A198252 A198253 A198254

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified March 25 01:17 EDT 2019. Contains 321450 sequences. (Running on oeis4.)