A206963 Number of nX4 0..3 arrays avoiding the pattern z z+1 z in any row, column or nw-to-se diagonal.

232, 53824, 9499613, 1657999936, 291206601222, 51177439652621, 8992951964423491, 1580210545765137782, 277669667860471764390, 48791299432306803317381, 8573463827804356246243292

Offset

1,1

Comments

Column 4 of A206967

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..2..3..1..3....3..2..2..1....3..1..1..2....1..3..0..1....0..2..2..1
..2..2..1..1....1..2..2..0....0..1..1..0....0..0..1..1....1..0..1..1
..3..2..0..1....1..3..1..3....0..0..3..0....0..1..1..3....2..2..1..0
..0..3..3..1....1..0..3..3....1..1..2..0....3..1..3..1....0..3..0..1

Crossrefs

Sequence in context: A206793 A206970 A206976 * A206573 A207578 A209088

Adjacent sequences: A206960 A206961 A206962 * A206964 A206965 A206966

Keyword

nonn

Author

R. H. Hardin, Feb 14 2012

Status

approved