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A028576 1/(4n) * sum over d|n of {mu(n/d) * (2d choose d)^2}. 1
1, 4, 33, 304, 3175, 35556, 420665, 5176000, 65664000, 853367900, 11309870605, 152342891952, 2080240006923 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A202765 A123780 A054371 * A093185 A198006 A075132

Adjacent sequences:  A028573 A028574 A028575 * A028577 A028578 A028579

KEYWORD

nonn

AUTHOR

Lionel Levine (levine(AT)ultranet.com)

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Last modified February 17 07:30 EST 2012. Contains 205998 sequences.