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Search: id:A066998
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| A066998 |
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a(0)=0; a(n)=n^2*a(n-1) + 1. |
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+0
1
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| 0, 1, 5, 46, 737, 18426, 663337, 32503514, 2080224897, 168498216658, 16849821665801, 2038828421561922, 293591292704916769, 49616928467130933962, 9724917979557663056553, 2188106545400474187724426
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n)=(n!)^2*sum(i=1, n, 1/(i!)^2).
a(n) = floor((1-BesselI(0, 2))*(n!)^2). - Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 02 2002
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CROSSREFS
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This is the same recurrence relation as A006040 except A006040 has a(0)=1.
Adjacent sequences: A066995 A066996 A066997 this_sequence A066999 A067000 A067001
Sequence in context: A071214 A052873 A052894 this_sequence A036246 A000872 A060392
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Jan 27 2002
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EXTENSIONS
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Better description from James D. Klein (kleiji(AT)wwc.edu), Feb 25 2002
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