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A166621
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a(n)=10*n-a(n-1), (with a(1)=5)
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0
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5, 15, 15, 25, 25, 35, 35, 45, 45, 55, 55, 65, 65, 75, 75, 85, 85, 95, 95, 105, 105, 115, 115, 125, 125, 135, 135, 145, 145, 155, 155, 165, 165, 175, 175, 185, 185, 195, 195, 205, 205, 215, 215, 225, 225, 235, 235, 245, 245, 255, 255, 265, 265, 275, 275, 285
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| a(n)=(5/2)+(5/2)*(-1)^n+5*n, with a(1)=5 [From Paolo P. Lava (paoloplava(AT)gmail.com), Nov 10 2009]
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EXAMPLE
| For n=2, a(2)=10*2-5=15; n=3, a(3)=10*3-15=15; n=4, a(4)=10*4-15=25
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CROSSREFS
| Sequence in context: A114332 A077348 A113259 * A160275 A200858 A184288
Adjacent sequences: A166618 A166619 A166620 * A166622 A166623 A166624
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KEYWORD
| nonn
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 18 2009
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