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A200794 Number of n X n 0..3 arrays with values 0..3 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 0
1, 15, 9880, 132636590, 26207146328784, 75743730886453371522, 3202145671418507455058837791 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A200801

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A308156 A304397 A206593 * A230173 A271403 A198720

Adjacent sequences:  A200791 A200792 A200793 * A200795 A200796 A200797

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 22 2011

STATUS

approved

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Last modified September 25 14:49 EDT 2021. Contains 347655 sequences. (Running on oeis4.)