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A089431 Even-positioned terms of A089423. 1
1, 2, 12, 120, 840, 5040, 55440, 720720, 720720, 24504480, 465585120 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A009546 A009748 A095717 * A119701 A127112 A003580

Adjacent sequences:  A089428 A089429 A089430 * A089432 A089433 A089434

KEYWORD

nonn

AUTHOR

Antti Karttunen (His_Firstname.His_Surname(AT)iki.fi), Nov 29 2003

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Last modified February 13 20:37 EST 2012. Contains 205554 sequences.