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A039735
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Triangle read by rows: T(n,k) = number of planar graphs with n >= 1 nodes and 0<=k<=3n-6) edges.
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4
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 2, 1, 1, 1, 1, 2, 4, 6, 6, 6, 4, 2, 1, 1, 1, 2, 5, 9, 15, 21, 24, 24, 20, 13, 5, 2, 1, 1, 2, 5, 10, 21, 41, 65, 97, 130, 144, 135, 98, 51, 16, 5, 1, 1, 2, 5, 11, 24, 56, 115, 221, 401, 658, 956, 1217, 1264, 1042, 631, 275, 72, 14, 1, 1, 2, 5
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,10
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REFERENCES
| R. C. Read and R. J. Wilson, An Atlas of Graphs, Oxford, 1998.
R. J. Wilson, Introduction to Graph Theory. Academic Press, NY, 1972, p. 162.
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EXAMPLE
| 1; 1,1; 1,1,1,1; 1,1,2,3,2,1,1; 1,1,2,4,6,6...
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CROSSREFS
| Cf. A005470 (row sums), A008406.
Sequence in context: A179008 A174985 A008406 * A171457 A129385 A096626
Adjacent sequences: A039732 A039733 A039734 * A039736 A039737 A039738
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KEYWORD
| nonn,tabf,nice
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AUTHOR
| Brendan McKay (bdm(AT)cs.anu.edu.au)
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