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A208315 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to more than two of its immediate leftward or upward or left-upward diagonal neighbors 1
1, 13, 2852, 5269968, 82063614224, 10768439015566880, 11907389879137262727680, 110953732239793838864921644288, 8712219181636799263542546576017159296, 5764706550248813633923105729304227646191895040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208322

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A203692 A187592 A287036 * A296174 A220642 A260982

Adjacent sequences:  A208312 A208313 A208314 * A208316 A208317 A208318

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 25 2012

STATUS

approved

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Last modified January 18 12:44 EST 2021. Contains 340254 sequences. (Running on oeis4.)