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

Author

R. H. Hardin, Dec 06 2013

Keywords

• nonn

Comments

Diagonal of A233256

Examples

			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
		

Links

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