A199845 Number of -6..6 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous

1, 7, 32, 149, 630, 2600, 10426, 41079, 159330, 611698, 2329458, 8818874, 33234990, 124835120, 467743203, 1749482957, 6535398559, 24393753898, 91006458115, 339442473410, 1266045976128, 4722720042212, 17621749081077, 65775214030886

Offset

1,2

Comments

Column 6 of A199847

Links

R. H. Hardin, Table of n, a(n) for n = 1..165

Example

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

Crossrefs

Sequence in context: A249999 A034360 A268745 * A188179 A050148 A188208

Adjacent sequences: A199842 A199843 A199844 * A199846 A199847 A199848

Keyword

nonn

Author

R. H. Hardin Nov 11 2011

Status

approved