A233250 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs)

1, 10, 4672, 23896064, 1159192379392, 525597937107992576, 2242238966451009797226496, 90075874398562137894702244954112, 34144912055691090021767126315871433129984

Offset

1,2

Comments

Diagonal of A233256

Links

R. H. Hardin, Table of n, a(n) for n = 1..15

Example

Some solutions for n=3
..0..1..2....0..1..2....0..1..2....0..1..5....0..1..0....0..1..0....0..1..0
..3..5..3....2..5..3....2..0..3....0..1..5....5..1..5....2..1..2....2..1..5
..3..4..5....3..4..5....1..5..3....5..2..5....2..4..3....3..0..3....5..2..5

Crossrefs

Sequence in context: A199354 A336831 A276241 * A273415 A223055 A308488

Adjacent sequences: A233247 A233248 A233249 * A233251 A233252 A233253

Keyword

nonn

Author

R. H. Hardin, Dec 06 2013

Status

approved