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A158149 Number of nondecreasing integer sequences of length 15 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 121, 225, 483, 892, 1726, 2999, 5517, 9136, 15691, 25423, 41668, 64943, 102972, 155880, 238808, 353814, 525710, 760658, 1106657, 1568464, 2228879, 3108245, 4333985, 5940271, 8151896, 11007043, 14867782, 19823198, 26397150 (list; graph; refs; listen; history; text; internal format)
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..405

CROSSREFS

Sequence in context: A158146 A158147 A158148 * A158150 A158151 A158152

Adjacent sequences:  A158146 A158147 A158148 * A158150 A158151 A158152

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified September 25 12:12 EDT 2022. Contains 356984 sequences. (Running on oeis4.)