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Search: id:A106539
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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
1
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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; listen)
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OFFSET
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1,5
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COMMENT
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Beginning with 0, 1, gives then 2, 4, 8, 16,... 2^(n-2)
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EXAMPLE
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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
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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
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Cf. A001571.
Sequence in context: A055404 A132165 A074444 this_sequence A048980 A055299 A000551
Adjacent sequences: A106536 A106537 A106538 this_sequence A106540 A106541 A106542
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KEYWORD
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easy,sign
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AUTHOR
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Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), May 08 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 03 2006
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