A183881 Number of arrangements of n+2 numbers in 0..6 with each number being the sum mod 7 of two others.

1, 1, 1231, 32521, 424537, 4079713, 33702403, 257404033, 1885866973, 13515603289, 95750388631, 674299155193, 4734193668289, 33187816266097, 232479450595819, 1627911123290065, 11397233380815013, 79786797746740777, 558527947985495935

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 6 of A183884

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..80