A214240 Number of 0..7 colorings of a 2X(n+1) array circular in the n+1 direction with new values 0..7 introduced in row major order.

4, 18, 354, 7749, 231799, 8178855, 318511707, 13046748480, 547969772934, 23296216625352, 996235422019600, 42723792981743991, 1834737810552367569, 78843837462576032709, 3389239985131275364833, 145715407979704223557482

Offset: 1

Author

R. H. Hardin Jul 08 2012

Keywords

• nonn

Comments

Row 2 of A214238

Examples

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

Links

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

Formula

Empirical: a(n) = 66*a(n-1) -867*a(n-2) -8354*a(n-3) +120414*a(n-4) +672756*a(n-5) -3902534*a(n-6) -24478884*a(n-7) +5777547*a(n-8) [phone]*a(n-9) [phone]*a(n-10) -166116762*a(n-11) -207075960*a(n-12)