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A188231
Number of nondecreasing arrangements of n numbers in -(n+2)..(n+2) with sum zero and not more than two numbers equal.
1
1, 5, 17, 81, 374, 1818, 8964, 45225, 231596, 1202495, 6313385, 33473871, 178991409, 964308854, 5229780968, 28531772394, 156491164870, 862470267275, 4774186037351, 26533145487533, 148001670048543, 828332995017980
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OFFSET
1,2
COMMENTS
Column 4 of
A188236
LINKS
R. H. Hardin,
Table of n, a(n) for n = 1..28
EXAMPLE
Some solutions for n=5
.-4...-6...-3...-6...-7...-7...-4...-4...-6...-7...-5...-3...-7...-7...-7...-4
.-4...-5...-2...-3...-4...-2...-2...-2...-2...-1...-5...-3...-6...-3...-5...-3
.-1....0...-1....1....2...-1...-1...-1....0....0...-4...-1....3...-1....3...-1
..4....4...-1....1....4....5....0....2....4....2....7....1....5....5....3....3
..5....7....7....7....5....5....7....5....4....6....7....6....5....6....6....5
CROSSREFS
Sequence in context:
A179605
A149751
A303713
*
A023253
A149752
A149753
Adjacent sequences:
A188228
A188229
A188230
*
A188232
A188233
A188234
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Mar 24 2011
STATUS
approved
