A207544 Number of n X n 0..2 arrays avoiding the pattern z-2 z-1 z in any row, column, nw-to-se diagonal or ne-to-sw antidiagonal

3, 81, 14974, 18584111, 151596413811, 8153351029428092, 2876868686935789680075, 6662940552094334528016043729, 101291421007307048419298014635301970

Offset

1,1

Comments

Diagonal of A207550

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..0..2..0..2....2..0..0..1....0..2..2..0....0..2..2..2....2..2..1..2
..2..2..0..2....1..1..0..1....1..0..0..0....1..1..0..2....2..1..0..0
..2..0..1..0....0..0..1..0....0..2..1..2....0..0..1..0....1..1..1..0
..0..2..1..0....1..1..0..0....0..0..0..0....1..2..0..2....0..1..0..2

Crossrefs

Sequence in context: A207195 A207215 A355071 * A207311 A206693 A223570

Adjacent sequences: A207541 A207542 A207543 * A207545 A207546 A207547

Keyword

nonn

Author

R. H. Hardin Feb 18 2012

Status

approved