A188176 - OEIS

A188176

Number of strictly increasing arrangements of n numbers in -(n+2)..(n+2) with sum zero

1, 4, 13, 43, 141, 480, 1656, 5744, 20094, 70922, 252117, 901723, 3243531, 11728606, 42611990, 155484150, 569585274, 2094177794, 7725489976, 28588154238, 106095329440, 394792407478, 1472734812454, 5506709078310, 20635115495666

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 4 of A188181

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..29

EXAMPLE

Some solutions for n=5

.-4...-5...-7...-5...-7...-6...-5...-3...-6...-6...-6...-4...-7...-7...-5...-6

.-3...-1...-2...-3...-5...-5...-4...-2...-4...-2...-3...-3...-2...-4...-4...-4

.-2....0....1...-2...-1....1...-1....0...-1....0...-1...-1....0....0...-3....2

..2....1....2....4....6....3....3....2....5....3....3....3....3....4....5....3

..7....5....6....6....7....7....7....3....6....5....7....5....6....7....7....5

CROSSREFS

Sequence in context: A266494 A121486 A339063 * A003688 A033434 A297928

Adjacent sequences: A188173 A188174 A188175 * A188177 A188178 A188179

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 23 2011

STATUS

approved

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