A188178 Number of strictly increasing arrangements of n numbers in -(n+4)..(n+4) with sum zero.

1, 6, 25, 104, 414, 1636, 6375, 24591, 94257, 360002, 1371535, 5216252, 19819846, 75277670, 285893124, 1085984406, 4126777398, 15690144942, 59691687518, 227248928264, 865788366806, 3301087870766, 12596381911969, 48104063936789

Offset: 1

Author

R. H. Hardin Mar 23 2011

Keywords

• nonn

Comments

Column 6 of A188181

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27