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Search: id:A057274
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| A057274 |
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Triangle T(n,k) of number of digraphs with a source on n labeled nodes with k arcs, k=0,1,..,n*(n-1). |
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+0
3
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| 1, 0, 2, 1, 0, 0, 9, 20, 15, 6, 1, 0, 0, 0, 64, 330, 720, 914, 792, 495, 220, 66, 12, 1, 0, 0, 0, 0, 625, 5804, 24560, 63940, 117310, 164260, 183716, 167780, 125955, 77520, 38760, 15504, 4845, 1140, 190, 20, 1
(list; graph; listen)
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OFFSET
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1,3
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EXAMPLE
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[1],[0,2,1],[0,0,9,20,15,6,1],[0,0,0,64,330,720,914,792,495,220,66,12,1],...; Number of digraphs with a source on 3 labeled nodes is 51=9+20+15+6+1.
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CROSSREFS
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Row sums give A003028. Cf. A057270-A057273, A057275-A057279.
Sequence in context: A057275 A057271 A021480 this_sequence A088632 A057272 A062735
Adjacent sequences: A057271 A057272 A057273 this_sequence A057275 A057276 A057277
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KEYWORD
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nonn,tabf
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AUTHOR
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Vladeta Jovovic, Goran Kilibarda (vladeta(AT)Eunet.yu), Sep 14 2000
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