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1, 2, 3, 6, 16, 60, 298, 1948, 16460, 179801, 2540520, 46485494, 1101504593, 33766488831, 1336910042036, 68237302714204, 4481677081035893
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OFFSET
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1,2
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COMMENTS
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Partial sums of number of connected partially ordered sets with n unlabeled elements. The subsequence of primes in this partial sum begins: 2, 3, 179801. Partial sum of Inverse Euler transform of A000112.
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LINKS
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CROSSREFS
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KEYWORD
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hard,nonn
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AUTHOR
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STATUS
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approved
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