A233127 Number of nX6 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or vertically, 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).

136, 124928, 127533056, 132682612736, 138791062863872, 145451790488305664, 152534173898504142848, 160000135886807521820672, 167846256915736431983329280, 176082743571854371127073701888

Offset: 1

Author

R. H. Hardin, Dec 04 2013

Keywords

• nonn

Comments

Column 6 of A233129

Examples

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

Links

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

Formula

Empirical: a(n) = 1984*a(n-1) -1314816*a(n-2) [phone]*a(n-3) -70111985664*a(n-4) [phone]*a(n-5) -389708152569856*a(n-6) +11733988091625472*a(n-7) -145241087982698496*a(n-8)