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A158184
Number of nondecreasing integer sequences of length 50 with sum zero and sum of absolute values 2n.
2
1, 4, 9, 25, 49, 121, 225, 484, 900, 1764, 3136, 5929, 10201, 18225, 30976, 53361, 88209, 148225, 240100, 393129, 627264, 1004004, 1575025, 2480625, 3833764, 5934093, 9060082, 13823450, 20838976, 31404082, 46810997, 69700899, 102868926
OFFSET
1,2
COMMENTS
a(n) = A000041(n)^2 for n<=25
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: A158181 A158182 A158183 * A001255 A357754 A133019
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 2009
STATUS
approved