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A158183 Number of nondecreasing integer sequences of length 49 with sum zero and sum of absolute values 2n. 1
1, 4, 9, 25, 49, 121, 225, 484, 900, 1764, 3136, 5929, 10201, 18225, 30976, 53361, 88209, 148225, 240100, 393129, 627264, 1004004, 1575025, 2480625, 3833763, 5934088, 9060062, 13823385, 20838791, 31403601, 46809832, 69698234, 102863104 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000041(n)^2 for n<=24

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..191

CROSSREFS

Sequence in context: A158180 A158181 A158182 * A158184 A001255 A133019

Adjacent sequences:  A158180 A158181 A158182 * A158184 A158185 A158186

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2009

STATUS

approved

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Last modified October 18 18:56 EDT 2019. Contains 328197 sequences. (Running on oeis4.)