A214139 Number of 0..4 colorings on an nX7 array circular in the 7 direction with new values 0..4 introduced in row major order.

147, 522515, 2000093424, 7658621867351, 29325981412599886, 112293482777565310571, 429988214977169477452677, 1646487940037763716348859705, 6304643807380348053085274173830

Offset: 1

Author

R. H. Hardin Jul 05 2012

Keywords

• nonn

Comments

Column 6 of A214141

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..65

Formula

Empirical: a(n) = 4156*a(n-1) -1272609*a(n-2) [phone]*a(n-3) -1222656178*a(n-4) -19887912212*a(n-5) [phone]*a(n-6) -2643328241280*a(n-7) [phone]*a(n-8) -1580167634944*a(n-9)