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A066972 Duplicate of A067819. 0
3, 12, 42, 144, 728, 2688, 10080, 39312, 127008, 423360, 2419200, 6773760, 32140800 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

CROSSREFS

Sequence in context: A135264 A084529 A017941 * A067819 A094970 A065179

Adjacent sequences:  A066969 A066970 A066971 * A066973 A066974 A066975

KEYWORD

dead

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Last modified February 17 10:05 EST 2012. Contains 206009 sequences.