login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A066070 a(1) = 1; for m > 0, a(2m) = 2(2m+1), a(2m+1) = 2m+1. 1
1, 6, 3, 10, 5, 14, 7, 18, 9, 22, 11, 26, 13, 30, 15, 34, 17, 38, 19, 42, 21, 46, 23, 50, 25, 54, 27, 58, 29, 62, 31, 66, 33, 70, 35, 74, 37, 78, 39, 82, 41, 86, 43, 90, 45, 94, 47, 98, 49, 102, 51, 106, 53, 110, 55, 114, 57, 118, 59, 122, 61, 126, 63, 130, 65, 134, 67, 138 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
O.g.f.: (x+6x^2+x^3-2x^4)/(1-x^2)^2. - Len Smiley, Dec 05 2001
MATHEMATICA
LinearRecurrence[{0, 2, 0, -1}, {1, 6, 3, 10}, 70] (* Harvey P. Dale, Jan 13 2022 *)
PROG
(PARI) { for (n=1, 1000, a=if (n%2, n, 2*n + 2); write("b066070.txt", n, " ", a) ) } \\ Harry J. Smith, Nov 09 2009
CROSSREFS
Cf. A066069.
Sequence in context: A355971 A327000 A249948 * A336319 A272549 A112456
KEYWORD
easy,nonn
AUTHOR
George E. Antoniou, Dec 02 2001
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 15 10:24 EDT 2024. Contains 371681 sequences. (Running on oeis4.)