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Search: id:A123022
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| A123022 |
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a(n)=n!*b(n) where b(0)=b(1)=1, b(n)=(n-4)b(n-2)/[n(n-1)] for n>=2. |
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1
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| 1, 1, -2, -1, 0, -1, 0, -3, 0, -15, 0, -105, 0, -945, 0, -10395, 0, -135135, 0, -2027025, 0, -34459425, 0, -654729075, 0, -13749310575, 0, -316234143225, 0, -7905853580625, 0, -213458046676875, 0, -6190283353629375, 0, -191898783962510625, 0, -6332659870762850625, 0
(list; graph; listen)
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OFFSET
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0,3
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REFERENCES
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Richard Bronson, Schaum's Outline of Modern Introductory Differential Equations, MacGraw-Hill, New York,1973, page 99, solved problem 19.1.
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MAPLE
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b[0]:=1: b[1]:=1: for n from 2 to 40 do b[n]:=(n-4)*b[n-2]/n/(n-1) od: seq(n!*b[n], n=0..40);
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MATHEMATICA
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a[n_] := a[n] = (n - 4)*a[n - 2]/(n*(n - 1)); a[0] = 1; a[1] = 1; Table[a[n]*n!, {n, 0, 30}]
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CROSSREFS
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Sequence in context: A158461 A144152 A116675 this_sequence A072943 A072175 A092147
Adjacent sequences: A123019 A123020 A123021 this_sequence A123023 A123024 A123025
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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 24 2006
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Oct 01 2006 and Nov 24 2006
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