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A089431
Even-indexed terms of A089423.
1
1, 2, 12, 120, 840, 5040, 55440, 720720, 720720, 24504480, 465585120
OFFSET
0,2
CROSSREFS
Sequence in context: A295864 A255506 A095717 * A119701 A362457 A364422
KEYWORD
nonn
AUTHOR
Antti Karttunen, Nov 29 2003
STATUS
approved