A158148 Number of nondecreasing integer sequences of length 14 with sum zero and sum of absolute values 2n.

1, 4, 9, 25, 49, 121, 225, 481, 882, 1690, 2899, 5275, 8622, 14633, 23387, 37834, 58113, 90924, 135610, 204938, 299216, 438428, 625118, 897211, 1253138, 1756603, 2414933, 3322105, 4489393, 6080038, 8096013, 10793738, 14197556, 18663320, 24250155

Offset

1,2

Comments

a(n) = A000041(n)^2 for n<=7

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

Links

R. H. Hardin, Table of n, a(n) for n=1..433

Crossrefs

Sequence in context: A038771 A158146 A158147 * A158149 A158150 A158151

Adjacent sequences: A158145 A158146 A158147 * A158149 A158150 A158151

Keyword

nonn

Author

R. H. Hardin Mar 13 2009

Status

approved