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A121921 A102897(n) - 1. 1
1, 3, 13, 121, 4959, 2771103, 151947502947 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
COMMENTS
Same as A102897, but counts nonempty set systems.
LINKS
CROSSREFS
Sequence in context: A057865 A344210 A260847 * A191955 A241458 A302861
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 17 2007
STATUS
approved

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Last modified July 17 18:25 EDT 2024. Contains 374377 sequences. (Running on oeis4.)