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A158140
Number of nondecreasing integer sequences of length 6 with sum zero and sum of absolute values 2n.
1
1, 4, 9, 22, 33, 67, 92, 156, 214, 318, 408, 597, 729, 990, 1221, 1586, 1885, 2423, 2820, 3512, 4090, 4958, 5674, 6857, 7729, 9150, 10335, 12052, 13441, 15627, 17270, 19830, 21924, 24894, 27304, 30963, 33715, 37876, 41277, 46022, 49835, 55489, 59786, 66132
OFFSET
1,2
COMMENTS
a(n) = A000041(n)^2 for n<=3
a(n) = A000041(n)^2 - cumulative A000712(2*n-1-length), 0 <= 2*n-1-length <= floor(n/2) [empirical].
LINKS
CROSSREFS
Sequence in context: A343322 A041743 A041943 * A290647 A105314 A200155
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 2009
STATUS
approved