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Search: id:A070992
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| 1, 3, 4, 7, 9, 12, 13, 17, 20, 25, 27, 32, 35, 39, 40, 45, 49, 56, 59, 67, 72, 79, 81, 88, 93, 101, 104, 111, 115, 120, 121, 127, 132, 141, 145, 156, 163, 173, 176, 187, 195, 208, 213, 225, 232, 241, 243, 252, 259, 271, 276, 289, 297, 308, 311, 321, 328, 339, 343, 352, 357
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(2n) = a(n-2)+2a(n-1)+2, a(2n+1) = 2a(n-1)+a(n)+2. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 08 2003
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PROGRAM
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(PARI) a(n)=if(n<2, if(n<1, 1, 3), if(n%2==0, if(n==2, 4, a(n/2-2)+2*a(n/2-1)+2), 2*a((n-3)/2)+a((n-1)/2)+2))
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CROSSREFS
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Sequence in context: A035238 A003136 A034022 this_sequence A060142 A049844 A140402
Adjacent sequences: A070989 A070990 A070991 this_sequence A070993 A070994 A070995
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), May 24 2002
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