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A057275
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Triangle T(n,k) of number of unilaterally connected digraphs on n labeled nodes and with k arcs, k=0,1,..,n*(n-1).
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2
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1, 0, 2, 1, 0, 0, 6, 20, 15, 6, 1, 0, 0, 0, 24, 222, 660, 908, 792, 495, 220, 66, 12, 1, 0, 0, 0, 0, 120, 2304, 15540, 52700, 109545, 161120, 182946, 167660, 125945, 77520, 38760, 15504, 4845, 1140, 190, 20, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| [1],[0,2,1],[0,0,6,20,15,6,1],[0,0,0,0,24,222,660,908,792,495,220,66,12,1],...; Number of unilaterally connected digraphs on 3 labeled nodes is 48=6+20+15+6+1.
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CROSSREFS
| Row sums give A003029. Cf. A057270-A057274, A057276-A057279.
Sequence in context: A057150 A185663 A105868 * A057271 A021480 A201299
Adjacent sequences: A057272 A057273 A057274 * A057276 A057277 A057278
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KEYWORD
| nonn,tabf
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AUTHOR
| Vladeta Jovovic, Goran Kilibarda (vladeta(AT)eunet.rs), Sep 14 2000
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