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A201617 Number of n X n 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 0
0, 16, 378, 91223, 136175057, 1492809994673 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A201625

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A027403 A264073 A333581 * A235672 A235729 A189766

Adjacent sequences:  A201614 A201615 A201616 * A201618 A201619 A201620

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 03 2011

STATUS

approved

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Last modified March 28 14:04 EDT 2020. Contains 333089 sequences. (Running on oeis4.)