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A020724 G.f.: 1/((1-6x)(1-9x)(1-12x)). 0
1, 27, 495, 7695, 109431, 1474767, 19198215, 244167615, 3055792311, 37811613807, 464078786535, 5662363023135, 68791291322391, 833094971965647, 10065613312624455, 121404092777808255, 1462402531680439671 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A020726 A020969 A025956 * A021994 A020568 A021734

Adjacent sequences:  A020721 A020722 A020723 * A020725 A020726 A020727

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 15 21:56 EST 2012. Contains 205860 sequences.