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A046742
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Triangle of number of connected graphs with k >= 1 edges and n nodes (2 <= n <= k+1).
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4
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1, 0, 1, 0, 1, 2, 0, 0, 2, 3, 0, 0, 1, 5, 6, 0, 0, 1, 5, 13, 11, 0, 0, 0, 4, 19, 33, 23, 0, 0, 0, 2, 22, 67, 89, 47, 0, 0, 0, 1, 20, 107, 236, 240, 106, 0, 0, 0, 1, 14, 132, 486, 797, 657, 235, 0, 0, 0, 0, 9, 138, 814, 2075, 2678, 1806, 551, 0, 0, 0, 0, 2, 95, 1454, 8404, 22950, 33851, 28908
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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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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LINKS
| Gordon Royle, Small graphs
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EXAMPLE
| 1; 0 1; 0 1 2; 0 0 2 3; 0 0 1 5 6; ... (so with 5 edges there's 1 graph with 4 nodes, 5 with 5 nodes and 1 with 6 nodes).
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CROSSREFS
| Cf. A002905, A008406, A046751, A054923, A054924.
Sequence in context: A122908 A091008 A111006 * A174739 A203994 A195022
Adjacent sequences: A046739 A046740 A046741 * A046743 A046744 A046745
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KEYWORD
| nonn,easy,nice,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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