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A201621 Number of nX4 0..3 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor 1
10, 211, 3699, 91223, 2111763, 45733593, 891142897, 15644678596, 249289360661, 3639136663173, 49094967861596, 616937242119695, 7271050760251026, 80851029109219123, 852557302953238048, 8562810135696296292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A201625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A254322 A327411 A112364 * A057408 A280903 A239770

Adjacent sequences:  A201618 A201619 A201620 * A201622 A201623 A201624

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 03 2011

STATUS

approved

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Last modified August 9 12:53 EDT 2022. Contains 356026 sequences. (Running on oeis4.)