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A143841
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Table read by antidiagonals: T(n,k) is the number of strongly connected directed multigraphs with loops with n arcs and k vertices.
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1
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1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 1, 2, 1, 0, 1, 1, 2, 3, 1, 0, 1, 1, 2, 4, 7, 1, 0, 1, 1, 2, 4
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,13
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COMMENTS
| Partial sums of the rows of A139622, i.e., T(n,k) = sum(T139622(n,p),p=0..k).
T(n,2) = T129620(n,2) - n(n-1)/2.
If k>=n, T(n,k) = A139627(n).
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CROSSREFS
| Cf. A138107, A129620, A143842.
Sequence in context: A133734 A109702 A115412 * A035440 A029878 A080934
Adjacent sequences: A143838 A143839 A143840 * A143842 A143843 A143844
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KEYWORD
| nonn,tabl
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AUTHOR
| Benoit Jubin (benoit_jubin(AT)yahoo.fr), Sep 02 2008
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