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A036782
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a(n) = n - 1 + Sum_{j=0..n} j!.
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1
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0, 2, 5, 12, 37, 158, 879, 5920, 46241, 409122, 4037923, 43954724, 522956325, 6749977126, 93928268327, 1401602636328, 22324392524329, 378011820620330, 6780385526348331, 128425485935180332, 2561327494111820333
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OFFSET
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0,2
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LINKS
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FORMULA
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E.g.f.: exp(x-1)*(Ei(1)-Ei(1-x)) + exp(x)*(x-1) + 1/(1-x). - Robert Israel, Jan 05 2015
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MAPLE
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N:= 30: # to get a(0) to a(N)
C:= ListTools:-PartialSums([seq(j!, j=0..N)]):
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PROG
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(PARI) a(n) = n - 1 + sum(j=0, n, j! ); \\ Joerg Arndt, Jan 06 2015
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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