login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A166138 Trisection A022998(3n+1). 2
1, 8, 7, 20, 13, 32, 19, 44, 25, 56, 31, 68, 37, 80, 43, 92, 49, 104, 55, 116, 61, 128, 67, 140, 73, 152, 79, 164, 85, 176, 91, 188, 97, 200, 103, 212, 109, 224, 115, 236, 121, 248, 127, 260, 133, 272, 139, 284, 145, 296, 151, 308, 157, 320, 163, 332, 169, 344, 175, 356, 181, 368, 187, 380, 193, 392 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

LINKS

Index to sequences with linear recurrences with constant coefficients, signature (0,2,0,-1).

FORMULA

a(2n) = 6n+1 = A016921(n).

a(2n+1) = 12n+8 = A017617(n).

a(n) = 2*a(n-2)-a(n-4) = (3n+1)*(3-(-1)^n)/2.

CROSSREFS

Cf. A165988, A166304.

Sequence in context: A019326 A051011 A075573 * A126937 A090099 A138809

Adjacent sequences:  A166135 A166136 A166137 * A166139 A166140 A166141

KEYWORD

nonn,easy

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Oct 08 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 16:39 EST 2012. Contains 205823 sequences.