A214108 Number of 0..3 colorings on an nX5 array circular in the 5 direction with new values 0..3 introduced in row major order.

10, 670, 44900, 3008980, 201647240, 13513419640, 905603817680, 60689173906000, 4067093973641120, 272556904729800160, 18265441319366096960, 1224061254004727782720, 82030646145243326825600

Offset: 1

Author

R. H. Hardin Jul 04 2012

Keywords

• nonn

Comments

Column 4 of A214112

Examples

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

Links

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

Formula

Empirical: a(n) = 68*a(n-1) -66*a(n-2).

Empirical: G.f. -10*x*(-1+x) / ( 1-68*x+66*x^2 ). - R. J. Mathar, Jul 04 2012