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A016101 (n! - n)/2 for even n. 0
0, 10, 357, 20156, 1814395, 239500794, 43589145593, 10461394943992, 3201186852863991, 1216451004088319990, 562000363888803839989, 310224200866619719679988, 201645730563302817791999987 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

George E. Andrews, Number Theory, Dover Publ., NY 1971, p. 39.

LINKS

Table of n, a(n) for n=1..13.

MATHEMATICA

Table[(n! - n)/2, {n, 2, 30, 2}]

CROSSREFS

Sequence in context: A217507 A217508 A217509 * A249847 A185255 A160523

Adjacent sequences:  A016098 A016099 A016100 * A016102 A016103 A016104

KEYWORD

nonn

AUTHOR

Robert G. Wilson v

STATUS

approved

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Last modified February 20 06:45 EST 2018. Contains 299358 sequences. (Running on oeis4.)