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A064120 A036981(n)/n!^2. 1
1, 6, 180, 873600, 772107033600 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A225776 A051357 A251671 * A041429 A089905 A222887
KEYWORD
nonn,hard
AUTHOR
N. J. A. Sloane, Dec 01 2001
STATUS
approved

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Last modified February 20 21:52 EST 2024. Contains 370219 sequences. (Running on oeis4.)