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A069152 a(n)=(n-1)!-n^tau(n)/n^2. 0
0, 1, 2, 23, 84, 719, 4976, 40311, 362780, 3628799, 39896064, 479001599, 6227020604, 87178290975, 1307674363904, 20922789887999, 355687427991024, 6402373705727999, 121645100408672000, 2432902008176639559 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,3

COMMENTS

n and a(n) have the same parity.

LINKS

Table of n, a(n) for n=2..21.

CROSSREFS

Cf. A062758.

Sequence in context: A097232 A222564 A099134 * A131464 A245331 A270868

Adjacent sequences:  A069149 A069150 A069151 * A069153 A069154 A069155

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 08 2002

STATUS

approved

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Last modified February 18 04:48 EST 2020. Contains 332011 sequences. (Running on oeis4.)