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A123301
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Triangle read by rows: T(n,k) = number of specially labeled bicolored nonseparable graphs with k points in one color class and n-k points in the other class . "Special" means there are separate labels 1,2, ...,k and 1,2, ...,n-k for the two color classes (n >= 1, k = 1, ..., n-1).
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1
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1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 0, 1, 34, 1, 0, 0, 1, 199, 199, 1, 0, 0, 1, 916, 7037, 916, 1, 0, 0, 1, 3889, 117071, 117071, 3889, 1, 0, 0, 1, 15982, 1535601, 6317926, 1535601, 15982, 1, 0, 0, 1, 64747, 18271947, 228842801, 228842801, 18271947
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 1,13
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REFERENCES
| R. W. Robinson, Numerical implementation of graph counting algorithms, AGRC Grant, Math. Dept., Univ. Newcastle, Australia, 1977.
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LINKS
| R. W. Robinson, Rows 1 through 25, flattened
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EXAMPLE
| Triangle begins:
T( 1, 1) = 1
T( 1, 2) = 0
T( 2, 1) = 0
T( 1, 3) = 0
T( 2, 2) = 1
T( 3, 1) = 0
T( 1, 4) = 0
T( 2, 3) = 1
T( 3, 2) = 1
T( 4, 1) = 0
T( 1, 5) = 0
T( 2, 4) = 1
T( 3, 3) = 34
T( 4, 2) = 1
T( 5, 1) = 0
T( 1, 6) = 0
T( 2, 5) = 1
T( 3, 4) = 199
T( 4, 3) = 199
T( 5, 2) = 1
T( 6, 1) = 0
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CROSSREFS
| Sequence in context: A171705 A023928 A022070 * A037933 A098765 A071788
Adjacent sequences: A123298 A123299 A123300 * A123302 A123303 A123304
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KEYWORD
| nonn,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 12 2006
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