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A012270 Duplicate of A009585. 0
0, 0, 2, 6, 22, 100, 668, 6048, 64776, 763488, 9676152, 131167080, 1900043880 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

CROSSREFS

Sequence in context: A088819 A177478 A052517 * A009585 A012267 A012268

Adjacent sequences:  A012267 A012268 A012269 * A012271 A012272 A012273

KEYWORD

dead

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.