A199846 Number of -7..7 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous

1, 8, 41, 206, 944, 4188, 17879, 74424, 303400, 1218440, 4833416, 18992142, 74057460, 287035502, 1107086841, 4253339267, 16289667330, 62230152461, 237255014892, 903101912666, 3433312226666, 13039708953325, 49488269035164

Offset

1,2

Comments

Column 7 of A199847

Links

R. H. Hardin, Table of n, a(n) for n = 1..146

Example

Some solutions for n=6
..4....4....6....7....6....4....3....4....4....6....6...-1....4....6....4....6
..2....4....2...-2....4....4....3....4....5....2....7....0....4....5....5....6
..1....0....2...-2....0...-2....2....1....4....2...-1....1....4....2....6...-1
.-1...-1...-3...-2...-1...-1...-1...-3...-1...-4...-1....2....1...-5...-4...-2
..0...-4...-2...-1...-4....0...-1...-2...-5...-3...-5....0...-7...-4...-6...-4
.-6...-3...-5....0...-5...-5...-6...-4...-7...-3...-6...-2...-6...-4...-5...-5

Crossrefs

Sequence in context: A273145 A273176 A080840 * A188180 A026968 A026978

Adjacent sequences: A199843 A199844 A199845 * A199847 A199848 A199849

Keyword

nonn

Author

R. H. Hardin Nov 11 2011

Status

approved