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Search: id:A049531
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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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+0
3
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OFFSET
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1,2
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REFERENCES
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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
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Cf. A049524, A003085, A035512, A003088, A051421.
Sequence in context: A121231 A122527 A039747 this_sequence A031508 A011806 A012953
Adjacent sequences: A049528 A049529 A049530 this_sequence A049532 A049533 A049534
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KEYWORD
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hard,nonn,nice
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AUTHOR
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Vladeta Jovovic, Goran Kilibarda (vladeta(AT)Eunet.yu)
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