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A126067
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Triangle read by rows: T(n,k) = number of self-converse digraphs with n nodes and k arcs, k=0..n*(n-1).
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0
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1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 3, 5, 9, 10, 12, 10, 9, 5, 3, 1, 1, 1, 1, 3, 6, 15, 24, 41, 57, 77, 84, 90, 84, 77, 57, 41, 24, 15, 6, 3, 1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,7
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EXAMPLE
| 1; 1,1,1; 1,1,2,2,2,1,1; 1,1,3,5,9,10,12,10,9,5,3,1,1; ....
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CROSSREFS
| Cf. A052283, A002499(row sums).
Sequence in context: A029432 A073426 A199840 * A048858 A172497 A135265
Adjacent sequences: A126064 A126065 A126066 * A126068 A126069 A126070
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KEYWORD
| more,nonn
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AUTHOR
| Vladeta Jovovic (vladeta(AT)eunet.rs), Feb 28 2007
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