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A138107
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Table read by antidiagonals: T(n,k) is the number of directed multigraphs with loops with n arcs and k vertices.
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4
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1, 1, 0, 1, 1, 0, 1, 2, 1, 0, 1, 2, 6, 1, 0, 1, 2, 10, 10, 1, 0, 1, 2, 11, 31, 19, 1, 0, 1, 2, 11, 47, 90, 28, 1, 0, 1, 2, 11, 51, 198, 222, 44, 1, 0, 1, 2, 11, 52, 269, 713, 520, 60, 1, 0, 1, 2, 11, 52, 291, 1270, 2423, 1090, 85, 1, 0, 1, 2, 11, 52, 295, 1596, 5776, 7388, 2180, 110, 1, 0
(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 A136564, i.e., T(n,k) = sum(T136564(n,p),p=0..k).
T(n,0)=A000007(n), T(n,1)=A000012(n), T(n,2)= A005993(n), T(n,3)= A050927(n), T(n,4)= A050929(n).
If k>=2n, T(n,k)=A052171(n).
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CROSSREFS
| Sequence in context: A138352 A129620 A074766 * A089631 A195982 A129558
Adjacent sequences: A138104 A138105 A138106 * A138108 A138109 A138110
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KEYWORD
| nonn,tabl
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AUTHOR
| Benoit Jubin (benoit_jubin(AT)yahoo.fr), May 03 2008
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EXTENSIONS
| More terms from Vladeta Jovovic and Benoit Jubin (benoit_jubin(AT)yahoo.fr), Sep 10 2008
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