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A057279
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Triangle T(n,k) of number of digraphs with a quasi-source on n unlabeled nodes and with k arcs, k=0,1,..,n*(n-1).
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9
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1, 0, 1, 1, 0, 0, 3, 4, 4, 1, 1, 0, 0, 0, 7, 21, 37, 47, 38, 27, 13, 5, 1, 1, 0, 0, 0, 0, 18, 90, 309, 661, 1125, 1477, 1665, 1489, 1154, 707, 379, 154, 61, 16, 5, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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REFERENCES
| V. Jovovic, G. Kilibarda, Enumeration of labeled quasi-initially connected digraphs, Discrete Math., 224 (2000), 151-163.
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EXAMPLE
| [1],[0,1,1],[0,0,3,4,4,1,1],[0,0,0,7,21,37,47,38,27,13,5,1,1],...; Number of digraphs with a quasi-source on 3 unlabeled nodes is 13=3+4+4+1+1.
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CROSSREFS
| Row sums give A049512. Cf. A057270-A057278.
Sequence in context: A177935 A021748 A132723 * A054733 A204255 A120649
Adjacent sequences: A057276 A057277 A057278 * A057280 A057281 A057282
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KEYWORD
| more,nonn,tabf
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AUTHOR
| Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs), Sep 14 2000
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