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A083568
Duplicate of A003121.
0
1, 1, 2, 12, 286, 33592, 23178480, 108995910720, 3973186258569120
OFFSET
1,3
CROSSREFS
Sequence in context: A014982 A012444 A012754 * A003121 A211937 A176037
KEYWORD
dead
STATUS
approved