A214189 Number of 0..6 colorings of a 2X(n+1) array circular in the n+1 direction with new values 0..6 introduced in row major order.

4, 18, 353, 7434, 198052, 5731144, 172707247, 5290686318, 163203090770, 5048858758020, 156379568912461, 4846014558069802, 150203703987575008, 4656019290676790496, 144332757507860933195, 4474265565293272517286

Offset: 1

Author

R. H. Hardin Jul 07 2012

Keywords

• nonn

Comments

Row 2 of A214187

Examples

			Some solutions for n=4
..0..1..2..3..1....0..1..0..1..2....0..1..2..0..1....0..1..2..0..1
..2..3..0..1..0....2..3..1..0..1....3..4..5..3..6....1..2..0..1..0
		

Links

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

Formula

Empirical: a(n) = 39*a(n-1) -133*a(n-2) -3905*a(n-3) +6437*a(n-4) +125497*a(n-5) +83961*a(n-6) -931595*a(n-7) -1308936*a(n-8) +809964*a(n-9) +1218672*a(n-10)