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Search: id:A097067
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| A097067 |
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Expansion of (1-4x+5x^2)/(1-2x)^2. |
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+0
4
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| 1, 0, 1, 4, 12, 32, 80, 192, 448, 1024, 2304, 5120, 11264, 24576, 53248, 114688, 245760, 524288, 1114112, 2359296, 4980736, 10485760, 22020096, 46137344, 96468992, 201326592, 419430400, 872415232, 1811939328, 3758096384
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OFFSET
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0,4
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COMMENT
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a(n+1)=A001787(n). Binomial transform of A097065. Binomial transform is (n-2)*2^(n-1)+2, or A048495 with an extra leading 1.
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FORMULA
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a(n)=(n-1)2^(n-2)+5*0^n/4; a(n)=4a(n-1)-4a(n-2), n>1.
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MAPLE
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a:=n->abs(floor(sum (2^(n-1), j=1..n))): seq(a(n), n=-1..28); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 27 2007
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CROSSREFS
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Essentially the same as A001787.
Sequence in context: A097392 A090634 A085750 this_sequence A139756 A001787 A118442
Adjacent sequences: A097064 A097065 A097066 this_sequence A097068 A097069 A097070
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KEYWORD
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easy,nonn
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Jul 22 2004
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