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Search: id:A057277
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| A057277 |
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Triangle T(n,k) of number of digraphs with a source on n unlabeled nodes with k arcs, k=0,1,..,n*(n-1). |
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3
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| 1, 0, 1, 1, 0, 0, 2, 4, 4, 1, 1, 0, 0, 0, 4, 16, 34, 46, 38, 27, 13, 5, 1, 1, 0, 0, 0, 0, 9, 56, 229, 573, 1058, 1448, 1653, 1487, 1153, 707, 379, 154, 61, 16, 5, 1, 1
(list; graph; listen)
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OFFSET
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1,7
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EXAMPLE
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[1], [0, 1, 1], [0, 0, 2, 4, 4, 1, 1], [0, 0, 0, 4, 16, 34, 46, 38, 27, 13, 5, 1, 1], ....
Number of digraphs with a source on 3 unlabeled nodes is 12=2+4+4+1+1.
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CROSSREFS
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Row sums give A051421. Cf. A057270-A057276, A057278-A057279.
Sequence in context: A090132 A099211 A094225 this_sequence A140734 A079536 A058923
Adjacent sequences: A057274 A057275 A057276 this_sequence A057278 A057279 A057280
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KEYWORD
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more,nonn,tabf
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AUTHOR
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Vladeta Jovovic, Goran Kilibard (vladeta(AT)Eunet.yu), Sep 14 2000
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