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A104145
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a(1) = 1; let A(k) = sequence of first 2^(k-1) terms; then A(k+1) is concatenation of A(k) and (A(k)-1) if a(k) is odd, or concatenation of A(k) and (A(k)+1) if a(k) is even.
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1
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1, 0, 2, 1, 2, 1, 3, 2, 0, -1, 1, 0, 1, 0, 2, 1, 2, 1, 3, 2, 3, 2, 4, 3, 1, 0, 2, 1, 2, 1, 3, 2, 0, -1, 1, 0, 1, 0, 2, 1, -1, -2, 0, -1, 0, -1, 1, 0, 1, 0, 2, 1, 2, 1, 3, 2, 0, -1, 1, 0, 1, 0, 2, 1, 0, -1, 1, 0, 1, 0, 2, 1, -1, -2, 0, -1, 0, -1, 1, 0, 1, 0, 2, 1, 2, 1, 3, 2, 0, -1, 1, 0, 1, 0, 2, 1, -1, -2, 0, -1, 0, -1, 1, 0, -2, -3, -1, -2, -1, -2, 0, -1, 0, -1, 1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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FORMULA
| a(n) = 1 - A137412(n). - Leroy Quet, Apr 22 2008
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EXAMPLE
| a(3) = 2 is even, so A(4) (1,0,2,1,2,1,3,2), the first 8 terms of the sequence, is A(3) (1,0,2,1) concatenated with each term of A(3) plus one (2,1,3,2).
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CROSSREFS
| Cf. A137412.
Sequence in context: A137753 A134780 A154819 * A123675 A123400 A196059
Adjacent sequences: A104142 A104143 A104144 * A104146 A104147 A104148
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KEYWORD
| easy,sign
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AUTHOR
| Leroy Quet, Mar 07 2005
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EXTENSIONS
| More terms from Joshua Zucker (joshua.zucker(AT)stanfordalumni.org), May 10 2006
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