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A065956
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Ceiling of (-1)^n*n!*(E(n,2)-E(n,1)*E(n-1,1)) where E(n,x) = Sum_{k=0..n} (-1)^k*x^k/k!.
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4
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1, 2, 3, 5, 9, 15, 27, 48, 87, 160, 296, 552, 1033, 1941, 3663, 6936, 13171, 25076, 47854, 91515, 175352, 336587, 647132, 1246070, 2402691, 4638909, 8967212, 17353538, 33618333, 65191863, 126535914, 245818071, 477938270, 929968029
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| 1, 2, 3, 5, 17/2, 89/6, 211/8, 1903/40, 62473/720, ...
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CROSSREFS
| Cf. A065952-A065955.
Sequence in context: A067847 A022858 A090905 * A178738 A060013 A092424
Adjacent sequences: A065953 A065954 A065955 * A065957 A065958 A065959
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 08 2001
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