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A158144 Number of nondecreasing integer sequences of length 10 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 118, 207, 414, 697, 1240, 1947, 3299, 4911, 7690, 11260, 16787, 23571, 34111, 46566, 65168, 87425, 118613, 155699, 207823, 267701, 349081, 444442, 569884, 714235, 904372, 1119056, 1396739, 1712996, 2110652, 2561649, 3129206 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=5

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..550

CROSSREFS

Sequence in context: A277900 A344701 A182988 * A247136 A158145 A082180

Adjacent sequences:  A158141 A158142 A158143 * A158145 A158146 A158147

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.)