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A021499
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Decimal expansion of 1/495.
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0
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0, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0, 2, 0
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| 0, then repeat 0, 2. [Arkadiusz Wesolowski, Jul 22 2011]
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FORMULA
| a(n) = 1 + (-1)^n - 2*(C(2*n,n) mod 2), with n>=0. - Paolo P. Lava, Nov 18 2009
a(n) = 1 + (-1)^n - 2*0^n = (-1 - A033999(n))*A062157(n). [From Arkadiusz Wesolowski, Jul 22 2011]
G.f.: 2*x^2/(1-x^2). - Bruno Berselli, Jul 22 2011
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CROSSREFS
| Sequence in context: A026611 A096972 A101227 * A176742 A010673 A084099
Adjacent sequences: A021496 A021497 A021498 * A021500 A021501 A021502
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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