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Search: id:A121966
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| A121966 |
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a(n) = a(n-1)-(n-1)*a(n-2). |
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+0
9
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| 1, 2, 1, -3, -6, 6, 36, 0, -252, -252, 2016, 4536, -17640, -72072, 157248, 1166256, -1192464, -19852560, 419328, 357765408, 349798176, -6805509984, -14151271680, 135569947968, 461049196608, -2792629554624, -14318859469824, 58289508950400, 444898714635648
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Hermite type recursion suggested by H[n+1]=x*H[n]-n*H[n-1]; x=1.
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REFERENCES
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Eugene Jahnke and Fritz Emde, Table of Functions with Formulae and Curves, Dover Book, New York,1945, page 32
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MATHEMATICA
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a[0] = 1; a[1] = 2; a[n_] := a[n] = a[n - 1] - (n - 1)*a[n - 2] Table[a[n], {n, 0, 30}]
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CROSSREFS
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Cf. A001503.
Sequence in context: A063707 A118287 A024930 this_sequence A021472 A053225 A050043
Adjacent sequences: A121963 A121964 A121965 this_sequence A121967 A121968 A121969
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KEYWORD
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sign
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 02 2006
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