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A158142 Number of nondecreasing integer sequences of length 8 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 46, 103, 163, 307, 478, 791, 1143, 1818, 2495, 3663, 4994, 7002, 9154, 12532, 15986, 21200, 26726, 34398, 42532, 54145, 65791, 81872, 98871, 121163, 144174, 175083, 206075, 246947, 289116, 342271, 397027, 467462, 537495, 626427 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=4

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..689

CROSSREFS

Sequence in context: A238334 A130448 A046451 * A158143 A082200 A244557

Adjacent sequences:  A158139 A158140 A158141 * A158143 A158144 A158145

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified August 12 17:17 EDT 2020. Contains 336439 sequences. (Running on oeis4.)