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A360880
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Triangle read by rows: T(n,k) is the number of unlabeled nonseparable (or 2-connected) multigraphs with n edges and k nodes, loops allowed, n >= 1, 2 <= k <= n + 1.
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2
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1, 2, 0, 4, 1, 0, 6, 2, 1, 0, 9, 6, 3, 1, 0, 12, 14, 13, 4, 1, 0, 16, 28, 39, 22, 5, 1, 0, 20, 52, 112, 98, 39, 6, 1, 0, 25, 93, 281, 383, 236, 63, 8, 1, 0, 30, 152, 655, 1304, 1220, 515, 102, 9, 1, 0, 36, 242, 1408, 3980, 5418, 3512, 1077, 153, 11, 1, 0
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OFFSET
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1,2
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LINKS
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EXAMPLE
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Triangle T(n,k) begins (n edges >= 1, k vertices >= 2):
1;
2, 0;
4, 1, 0;
6, 2, 1, 0;
9, 6, 3, 1, 0;
12, 14, 13, 4, 1, 0;
16, 28, 39, 22, 5, 1, 0;
20, 52, 112, 98, 39, 6, 1, 0;
25, 93, 281, 383, 236, 63, 8, 1, 0;
30, 152, 655, 1304, 1220, 515, 102, 9, 1, 0;
...
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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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