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A001196
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Double-bitters: only even length runs in binary expansion.
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17
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0, 3, 12, 15, 48, 51, 60, 63, 192, 195, 204, 207, 240, 243, 252, 255, 768, 771, 780, 783, 816, 819, 828, 831, 960, 963, 972, 975, 1008, 1011, 1020, 1023, 3072, 3075, 3084, 3087, 3120, 3123, 3132, 3135, 3264, 3267, 3276, 3279, 3312
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Numbers whose set of base 4 digits is {0,3} - Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 3 2004.
n such that there exists a permutation p_1, ..., p_n of 1, ..., n such that i + p_i is a power of 4 for every i - Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 3 2004
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LINKS
| R. Stephan, Some divide-and-conquer sequences ...
R. Stephan, Table of generating functions
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FORMULA
| a(2n) = 4a(n), a(2n+1) = 4a(n) + 3.
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CROSSREFS
| 3 times the Moser-de Bruijn sequence A000695.
Cf. A005823, A097252-A097262.
Sequence in context: A044828 A022380 A005392 * A096854 A013191 A009783
Adjacent sequences: A001193 A001194 A001195 * A001197 A001198 A001199
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KEYWORD
| nonn,base
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), bart(AT)xs4all.nl (Bart la Bastide)
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