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

26, 2271, 256836, 45733593, 8368969235, 1492809994673, 242036871702096, 35298906093734951, 4642502137893927659, 554913226364951538300, 60802653561518861509758, 6157866184324500142914732

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: A266030 A103642 A363990 * A087616 A177636 A232159

Adjacent sequences: A201620 A201621 A201622 * A201624 A201625 A201626

Keyword

nonn

Author

R. H. Hardin Dec 03 2011

Status

approved