A183889 Number of arrangements of n+3 numbers in 0..6 with each number being the sum mod 7 of three others.

1, 1, 32821, 542557, 4978219, 38280865, 277198249, 1964161189, 13808869207, 96809981737, 678032111797, 4747103957005, 33231843226435, 232627950507697, 1628407600271233, 11398881253796341, 79792234154371567, 558545790385795897

Offset: 1

Author

R. H. Hardin Jan 07 2011

Keywords

• nonn

Comments

Column 6 of A183892

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..37