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A098980 Duplicate of A007647. 0
1, 3, 9, 21, 363, 2161, 4839, 49521, 105994 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A193374 A191998 A362341 * A007647 A247182 A363967
KEYWORD
dead
STATUS
approved

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Last modified May 6 13:11 EDT 2024. Contains 372293 sequences. (Running on oeis4.)