A199844 Number of -5..5 arrays x(0..n-1) of n elements with zero sum and no element more than one greater than the previous.

1, 6, 25, 103, 399, 1532, 5754, 21383, 78735, 288580, 1053894, 3840866, 13981403, 50874249, 185128907, 673970102, 2455319377, 8952722626, 32676307483, 119391572211, 436711281979, 1599194641093, 5862625449021, 21515851244159

Offset

1,2

Comments

Column 5 of A199847.

Links

R. H. Hardin, Table of n, a(n) for n = 1..186

Example

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

Crossrefs

Cf. A199847.

Sequence in context: A037537 A253220 A037481 * A267536 A029871 A188178

Adjacent sequences: A199841 A199842 A199843 * A199845 A199846 A199847

Keyword

nonn

Author

R. H. Hardin, Nov 11 2011

Status

approved