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A201623 Number of nX6 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0
26, 2271, 256836, 45733593, 8368969235, 1492809994673, 242036871702096, 35298906093734951, 4642502137893927659, 554913226364951538300, 60802653561518861509758, 6157866184324500142914732 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A201625

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Sequence in context: A173949 A266030 A103642 * A087616 A177636 A232159

Adjacent sequences:  A201620 A201621 A201622 * A201624 A201625 A201626

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 03 2011

STATUS

approved

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Last modified April 3 17:03 EDT 2020. Contains 333197 sequences. (Running on oeis4.)