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A052263
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Number of 5-colored labeled graphs on n nodes(divided by 1024).
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0
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0, 0, 0, 0, 1, 240, 62720, 23224320, 13440516096, 12754259804160, 20377681883299840, 55671587500342640640, 262483693581093123915776, 2147534811240814766425374720, 30585643102219392981931508367360
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,6
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REFERENCES
| R. C. Read, The number of k-colored graphs on labeled nodes, Canad. J.Math., 12 (1960), 410-414.
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FORMULA
| a(n, k) = (1/k)*Sum_{r=1..n-1} C(n, r) 2^(r*(n-r)) a(r, k-1).
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CROSSREFS
| Cf. A000683, A006201, A006202.
Sequence in context: A205256 A110163 A001943 * A035281 A008696 A047806
Adjacent sequences: A052260 A052261 A052262 * A052264 A052265 A052266
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KEYWORD
| easy,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 03 2000
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