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Search: id:A160936
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| A160936 |
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a(n)= n * reversal(n-1) * reversal(n+1) |
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+0
1
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| 0, 6, 24, 60, 120, 210, 336, 504, 72, 990, 231, 4092, 11193, 22134, 37515, 57936, 83997, 116298, 3078, 21840, 924, 8448, 21252, 39936, 65100, 97344, 137268, 185472, 7134, 35880, 2139, 13728, 32637, 59466, 94815, 139284, 193473, 257982, 12948
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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a(8)=8*R(7)*R(9)=7*8*9=504; a(15)=15*R(14)*R(16)=15*41*61=37515; a(26)=26*R(25)*R(27)=26*52*72=97344
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EXAMPLE
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a(12)=12*11*31=4092. [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 24 2009]
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MAPLE
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rev := proc (n) local nn: nn := convert(n, base, 10); add(nn[j]*10^(nops(nn)-j), j = 1 .. nops(nn)) end proc: seq(n*rev(n-1)*rev(n+1), n = 1 .. 40); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jun 24 2009]
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CROSSREFS
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Sequence in context: A002653 A086768 A160944 this_sequence A007531 A130669 A101854
Adjacent sequences: A160933 A160934 A160935 this_sequence A160937 A160938 A160939
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KEYWORD
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nonn,base
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AUTHOR
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Claudio L Meller (claudiomeller(AT)gmail.com), May 30 2009
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