A158151 Number of nondecreasing integer sequences of length 17 with sum zero and sum of absolute values 2n.

1, 4, 9, 25, 49, 121, 225, 484, 899, 1756, 3098, 5790, 9779, 17092, 28252, 47222, 75258, 121818, 188762, 295544, 448275, 681330, 1009650, 1502269, 2181026, 3170981, 4528407, 6459739, 9066916, 12725984, 17593349, 24303397, 33163304, 45157095

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n=1..363

Formula

a(n) = A000041(n)^2 for n <= 8.

a(n) = A000041(n)^2 - cumulative A000712(2*n-1-length), 0 <= 2*n-1-length <= floor(n/2) [empirical].

Crossrefs

Column k=17 of A389686.

Sequence in context: A158148 A158149 A158150 * A158152 A158153 A158154

Adjacent sequences: A158148 A158149 A158150 * A158152 A158153 A158154

Keyword

nonn

Author

R. H. Hardin, Mar 13 2009

Status

approved