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2, 12, 52, 212, 852, 3412, 13652, 54612, 218452, 873812, 3495252, 13981012, 55924052, 223696212, 894784852, 3579139412, 14316557652, 57266230612, 229064922452, 916259689812, 3665038759252, 14660155037012, 58640620148052, 234562480592212, 938249922368852
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| These numbers have a simple binary pattern: 10,1100,110100,11010100,1101010100, ... i.e. the n-th term has a binary expansion 1(10){n-1}0, that is, there are n-1 10's between the most significant 1 and the least significant 0.
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..170
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PROG
| (MAGMA) [(5*4^n-8)/6: n in [1..40] ]; // Vincenzo Librandi, Apr 28 2011
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CROSSREFS
| a(n) = A072197(n-1) - 1 = A014486(|A106191(n)|). a(n) = A079946(A020988(n-2)) for n>=2. Cf. also A122229.
Sequence in context: A043007 A176580 A179259 * A007225 A139046 A036359
Adjacent sequences: A080672 A080673 A080674 * A080676 A080677 A080678
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Mar 02 2003
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EXTENSIONS
| Further comments added by Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Sep 14 2006.
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