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A158145
Number of nondecreasing integer sequences of length 11 with sum zero and sum of absolute values 2n.
1
1, 4, 9, 25, 49, 120, 217, 446, 773, 1408, 2279, 3955, 6073, 9760, 14692, 22467, 32445, 48073, 67444, 96568, 132921, 184487, 248245, 338391, 446533, 594557, 774198, 1012918, 1297749, 1674816, 2117060, 2691887, 3368516, 4226714, 5231183, 6500798
OFFSET
1,2
COMMENTS
a(n) = A000041(n)^2 for n<=5
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: A182988 A158144 A247136 * A372743 A082180 A246131
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 2009
STATUS
approved