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A086828
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a(1) = 0, a(2) = 1, a(3) = 1, a(4) = 7; thereafter, a(n) = a(n-1) + (n-1)*a(n-2).
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0
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0, 1, 1, 7, 11, 46, 112, 434, 1330, 5236, 18536, 76132, 298564, 1288280, 5468176, 24792376, 112283192, 533753584, 2554851040, 12696169136, 63793189936, 330412741792, 1733862920384, 9333355981600, 50946066070816
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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COMMENTS
| Number of networks with bandwidth n.
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REFERENCES
| P. C. Gilmore et al., Well-solved special cases, pp. 87-143 of E. L. Lawler et al., eds., The Traveling Salesman Problem, Wiley, 1985.
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CROSSREFS
| Sequence in context: A129865 A153377 A062209 * A117392 A105867 A166653
Adjacent sequences: A086825 A086826 A086827 * A086829 A086830 A086831
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Aug 08 2003
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EXTENSIONS
| More terms from David Wasserman (dwasserm(AT)earthlink.net), Apr 01 2005
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