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A350450
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Triangle read by rows: T(n,k) is the number of unlabeled weakly connected acyclic digraphs with n arcs and k vertices, n >= 0, k = 1..n+1.
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7
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1, 0, 1, 0, 0, 3, 0, 0, 1, 8, 0, 0, 0, 9, 27, 0, 0, 0, 6, 54, 91, 0, 0, 0, 1, 79, 320, 350, 0, 0, 0, 0, 63, 732, 1788, 1376, 0, 0, 0, 0, 33, 1136, 6012, 9933, 5743, 0, 0, 0, 0, 10, 1281, 14378, 45225, 54502, 24635, 0, 0, 0, 0, 1, 1056, 26529, 151848, 322736, 298250, 108968
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graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,6
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LINKS
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EXAMPLE
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Triangle begins:
1;
0, 1;
0, 0, 3;
0, 0, 1, 8;
0, 0, 0, 9, 27;
0, 0, 0, 6, 54, 91;
0, 0, 0, 1, 79, 320, 350;
0, 0, 0, 0, 63, 732, 1788, 1376;
0, 0, 0, 0, 33, 1136, 6012, 9933, 5743;
...
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PROG
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(PARI) \\ See PARI link in A122078 for program code.
{ my(T=WeakAcyclicDigraphsTr(10)); for(n=1, #T, print(T[n])); }
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CROSSREFS
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KEYWORD
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AUTHOR
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STATUS
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approved
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