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, 14, 10366, 156617480, 37069738362057, 136398703432330477549, 7801822458198433796561428608, 6937084083184530563330081968289999750, 95885498147917477608538934758547979039384601906

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