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A208194 Number of n X n 0..3 arrays with new values 0..3 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, 14, 10366, 156617480, 37069738362057, 136398703432330477549, 7801822458198433796561428608, 6937084083184530563330081968289999750, 95885498147917477608538934758547979039384601906 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A208201

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..10

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A147686 A048913 A246623 * A333954 A104376 A053870

Adjacent sequences: A208191 A208192 A208193 * A208195 A208196 A208197

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 24 2012

STATUS

approved

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Last modified December 1 18:31 EST 2022. Contains 358475 sequences. (Running on oeis4.)