A233126 Number of nX5 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).

36, 10496, 3497984, 1189609472, 406142844928, 138791062863872, 47441169369530368, 16217390240149536768, 5543904365985920974848, 1895191786824003443752960, 647875237241500909514522624

Offset: 1

Author

R. H. Hardin, Dec 04 2013

Keywords

• nonn

Comments

Column 5 of A233129

Examples

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

Links

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

Formula

Empirical: a(n) = 544*a(n-1) -82944*a(n-2) +5144576*a(n-3) -146800640*a(n-4) [phone]*a(n-5) -8589934592*a(n-6)