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Search: id:A123850
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| A123850 |
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Triangle read by rows: T(n,k) = orientable embedding number gamma_k for bouquet B_n, n >= 0, 0 <= k <= [n/2]. |
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+0
2
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| 1, 1, 4, 2, 40, 80, 672, 3360, 1008, 16128, 161280, 185472
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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J. L. Gross and J. Yellen, eds., Handbook of Graph Theory, CRC Press, 2004; p. 649.
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FORMULA
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Reference gives a recurrence.
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EXAMPLE
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Triangle begins:
1
1
4 2
40 80
672 3360 1008
16128 161280 185472
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CROSSREFS
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Columns give A005431, A123828. Row sums are (2n-1)1.
Adjacent sequences: A123847 A123848 A123849 this_sequence A123851 A123852 A123853
Sequence in context: A086482 A078758 A102015 this_sequence A120968 A107667 A010319
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KEYWORD
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nonn,tabf,more
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AUTHOR
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njas, Nov 19 2006
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