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A208863
Number of nX7 0..3 arrays with new values 0..3 introduced in row major order and no element equal to more than one of its immediate leftward or upward or left-upward diagonal neighbors
1
715, 4313071, 28686344276, 192108983085145, 1287681340443915644, 8632160191264007914496, 57867813487534623493632032, 387931894337100662003223085624, 2600602689186684798782025006594196
OFFSET
1,1
COMMENTS
Column 7 of A208864
LINKS
EXAMPLE
Some solutions for n=4
..0..0..1..2..1..1..3....0..1..2..3..0..1..2....0..0..0..0..0..0..1
..2..1..3..3..0..2..3....0..1..2..3..0..2..0....1..1..1..1..1..1..0
..2..1..2..2..1..1..0....3..0..2..0..3..1..1....2..3..2..2..2..0..3
..2..0..3..0..0..2..1....2..0..2..0..1..0..3....3..0..1..0..0..3..2
CROSSREFS
Sequence in context: A140919 A208352 A223061 * A208871 A208878 A208174
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 02 2012
STATUS
approved