A199701 Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no two neighbors equal.

1, 10, 82, 724, 6504, 59992, 559028, 5252900, 49700882, 472873888, 4519281222, 43353372676, 417214414596, 4026070558436, 38943205468034, 377469980604452, 3665456335373858, 35651726951195532, 347268836196275908

Offset: 1

Author

R. H. Hardin Nov 09 2011

Keywords

• nonn

Comments

Column 5 of A199704

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..200