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A158146 Number of nondecreasing integer sequences of length 12 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 121, 222, 466, 828, 1537, 2546, 4506, 7097, 11656, 17964, 28080, 41533, 62829, 90245, 131868, 185633, 262931, 361620, 502438, 677292, 919091, 1221175, 1627409, 2126641, 2793158, 3599216, 4655834, 5933603, 7571871, 9539554 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=6

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..474

CROSSREFS

Sequence in context: A030146 A229970 A038771 * A158147 A158148 A158149

Adjacent sequences:  A158143 A158144 A158145 * A158147 A158148 A158149

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified August 10 04:27 EDT 2022. Contains 356029 sequences. (Running on oeis4.)