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A046745
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Number of connected graphs with <= n edges.
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0
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1, 2, 5, 10, 22, 52, 131, 358, 1068, 3390, 11461, 40964, 153786, 603927, 2471798, 10509270, 46296937, 210848414, 990794383, 4795761825, 23875074600, 122086530809, 640484152252, 3443478138871
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| G. A. Baker et al., High-temperature expansions for the spin-1/2 Heisenberg model, Phys. Rev., 164 (1967), 800-817.
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CROSSREFS
| Partial sums of A002905.
Sequence in context: A123491 A166300 A038149 * A198950 A068054 A174542
Adjacent sequences: A046742 A046743 A046744 * A046746 A046747 A046748
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 10 2001
More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jul 05 2003
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