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A049531
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Number of digraphs with a source and a sink on n unlabeled nodes.
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2
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OFFSET
| 1,2
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REFERENCES
| V. Jovovic, G. Kilibarda, Enumeration of labeled initially-finally connected digraphs, Scientific review, Serbian Scientific Society, 19-20 (1996), p. 246.
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CROSSREFS
| Cf. A049524, A003085, A035512, A003088, A051421.
Sequence in context: A121231 A122527 A039747 * A031508 A202140 A011806
Adjacent sequences: A049528 A049529 A049530 * A049532 A049533 A049534
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KEYWORD
| hard,nonn,nice
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AUTHOR
| Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs)
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