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A005015
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a(n) = 11*2^n.
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13
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11, 22, 44, 88, 176, 352, 704, 1408, 2816, 5632, 11264, 22528, 45056, 90112, 180224, 360448, 720896, 1441792, 2883584, 5767168, 11534336, 23068672, 46137344, 92274688, 184549376, 369098752, 738197504, 1476395008, 2952790016, 5905580032, 11811160064
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OFFSET
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0,1
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COMMENTS
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A144472=-1,2,9,13,31,57,.... a(n)=A144472(n+1)+A144472(n+2). Also a(n)=A144472(n+3)-A144472(n+1). A144472(n+1) is a Jacobsthal sequence from 2 and 9: A144472(n+3)=A144472(n+2)+2*A144472(n+1). Note a(n) mod 9=period 6:repeat 2,4,8,7,5,1=A153130(n+1). - Paul Curtz, Jan 06 2009
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LINKS
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FORMULA
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G.f.: 11/(1-2*x).
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MATHEMATICA
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PROG
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CROSSREFS
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Row sums of (10, 1)-Pascal triangle A093645.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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