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A046165
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Number of minimal covers of n objects.
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6
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1, 2, 8, 49, 462, 6424, 129425, 3731508, 152424420, 8780782707, 710389021036, 80610570275140, 12815915627480695, 2855758994821922882, 892194474524889501292, 391202163933291014701953, 240943718535427829240708786, 208683398342300491409959279244
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Eric Weisstein's World of Mathematics, Minimal Cover
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FORMULA
| E.g.f.: Sum((exp(x)-1)^n*exp(x*(2^n-n-1))/n!, n=0..infinity). - Vladeta Jovovic (vladeta(AT)eunet.rs), May 08 2004
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MAPLE
| a:= n-> add (add ((-1)^i* binomial(k, i) *(2^k-1-i)^n, i=0..k)/k!, k=0..n): seq (a(n), n=1..20); # Alois P. Heinz, Aug 19 2008
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CROSSREFS
| Cf. A035348, A000371, A003465.
Sequence in context: A088181 A058864 A136226 * A114619 A027047 A034491
Adjacent sequences: A046162 A046163 A046164 * A046166 A046167 A046168
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KEYWORD
| nonn
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AUTHOR
| Eric Weisstein (eric(AT)weisstein.com)
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