A188234 Number of nondecreasing arrangements of n numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal

1, 8, 40, 234, 1317, 7435, 41748, 234413, 1316060, 7395049, 41601836, 234385104, 1322693568, 7477225191, 42343586740, 240215460615, 1365117760484, 7771029244519, 44310379612078, 253062451888388, 1447507286439975

Offset

1,2

Comments

Column 7 of A188236

Links

R. H. Hardin, Table of n, a(n) for n = 1..25

Example

Some solutions for n=4
.-8...-6...-8...-9...-6...-4...-8...-8...-5...-6...-7...-4...-6...-8...-4...-7
..2...-2...-5...-1...-1...-4...-2....0...-3...-5...-4...-2....0...-6...-3...-5
..3....4....5....4...-1....3....2....2....4....4....5...-1....1....5....1....6
..3....4....8....6....8....5....8....6....4....7....6....7....5....9....6....6

Crossrefs

Sequence in context: A272396 A051199 A228679 * A068775 A068774 A073955

Adjacent sequences: A188231 A188232 A188233 * A188235 A188236 A188237

Keyword

nonn

Author

R. H. Hardin Mar 24 2011

Status

approved