|
| |
|
|
A188113
|
|
Number of strictly increasing arrangements of n nonzero numbers in -(2n-2)..(2n-2) with sum zero
|
|
1
|
|
|
|
0, 2, 4, 31, 172, 1154, 8044, 58595, 439514, 3379972, 26513202, 211413199, 1709183316, 13981482114, 115537553904, 963234521237, 8093123460146, 68468543003422, 582819983344618, 4988538052577712, 42911585401063684
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
COMMENTS
|
Diagonal of A188122
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..32
|
|
|
EXAMPLE
|
Some solutions for n=6
-10...-9...-9...-8...-7...-7...-8...-8...-9...-9...-9..-10...-6...-7...-7...-8
.-6...-8...-4...-4...-6...-5...-6...-7...-7...-6...-5...-6...-4...-2...-3...-7
.-4...-5...-1...-2...-4...-2...-3...-6...-3...-4...-4....1...-3...-1...-1...-1
..4....6....2....2....3....2...-2....5....1....2....2....4....2....1....1....4
..6....7....5....4....4....5....9....6....8....7....6....5....4....2....2....5
.10....9....7....8...10....7...10...10...10...10...10....6....7....7....8....7
|
|
|
CROSSREFS
|
Sequence in context: A018294 A181620 A220283 * A051569 A087186 A051759
Adjacent sequences: A188110 A188111 A188112 * A188114 A188115 A188116
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin Mar 21 2011
|
|
|
STATUS
|
approved
|
| |
|
|
