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A158150 Number of nondecreasing integer sequences of length 16 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 121, 225, 484, 897, 1746, 3062, 5684, 9515, 16498, 27028, 44780, 70648, 113282, 173670, 269204, 403919, 607492, 890300, 1310859, 1881880, 2706891, 3822825, 5395027, 7488282, 10399032, 14217293, 19432101, 26226966, 35336049 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

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].

LINKS

R. H. Hardin, Table of n, a(n) for n=1..383

CROSSREFS

Sequence in context: A158147 A158148 A158149 * A158151 A158152 A158153

Adjacent sequences: A158147 A158148 A158149 * A158151 A158152 A158153

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified December 5 04:50 EST 2022. Contains 358578 sequences. (Running on oeis4.)