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A106539
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a(n)=(n-1)*a(n-1)-(n-2)*a(n-2)-...-a(1). Beginning with a(0)=1, a(1)=1.
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0
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1, 1, 1, 0, -6, -36, -192, -1104, -7248, -54816, -472512, -4573824, -49064448, -577130496, -7381281792, -101940854784, -1511556077568, -23945902043136, -403579232182272, -7209532170092544, -136064164749017088, -2705030337674674176, -56501002847058788352
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,5
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COMMENTS
| Beginning with 0, 1, gives then 2, 4, 8, 16,... 2^(n-2)
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EXAMPLE
| a(7)=6*(-36)-5(-6)-4*0-3*1-2*1-1*1=-216+30-0-3-2-1=-192
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MAPLE
| a[0]:=1: a[1]:=1: for n from 2 to 24 do a[n]:=(n-1)*a[n-1]-add(k*a[k], k=1..n-2) od: seq(a[n], n=1..24); (Deutsch)
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CROSSREFS
| Cf. A001571.
Sequence in context: A074444 A146883 A159721 * A048980 A055299 A000551
Adjacent sequences: A106536 A106537 A106538 * A106540 A106541 A106542
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KEYWORD
| easy,sign
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AUTHOR
| Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), May 08 2005
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 03 2006
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