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A129620
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Table read by antidiagonals: T(n,k) is the number of 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, 2, 1, 0, 1, 2, 5, 1, 0, 1, 2, 8, 9, 1, 0, 1, 2, 8, 24, 17, 1, 0, 1, 2, 8, 32
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,8
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COMMENTS
| Partial sums of the rows of A139621, i.e., T(n,k) = sum(T139621(n,p),p=0..k).
T(n,2) = T138107(n,2) - floor(n/2).
If k >= n+1, T(n,k) = A137975(n).
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CROSSREFS
| Cf. A138107.
Sequence in context: A114503 A103528 A138352 * A074766 A138107 A089631
Adjacent sequences: A129617 A129618 A129619 * A129621 A129622 A129623
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KEYWORD
| nonn,tabl
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AUTHOR
| Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 06 2008
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