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A158147 Number of nondecreasing integer sequences of length 13 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 121, 224, 476, 862, 1629, 2750, 4942, 7947, 13290, 20892, 33272, 50229, 77373, 113409, 168716, 242193, 349279, 489700, 692174, 950812, 1312535, 1775675, 2406215, 3200557, 4271720, 5600464, 7359874, 9536595, 12359775, 15825600 (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..450

CROSSREFS

Sequence in context: A229970 A038771 A158146 * A158148 A158149 A158150

Adjacent sequences:  A158144 A158145 A158146 * A158148 A158149 A158150

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified September 29 18:39 EDT 2022. Contains 357090 sequences. (Running on oeis4.)