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A198250 Number of 2nX10 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors 0
15, 6528, 4059950, 2606019472, 1683040515731, 1088857594220452, 704825868750085006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A198253

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

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

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

..0..0..0..0..0..0..0..0..3..3....0..0..0..0..0..0..3..3..0..0

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

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

CROSSREFS

Sequence in context: A206360 A292972 A204677 * A066968 A113795 A205155

Adjacent sequences: A198247 A198248 A198249 * A198251 A198252 A198253

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 22 2011

STATUS

approved

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Last modified January 27 12:24 EST 2023. Contains 359840 sequences. (Running on oeis4.)