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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A173332 a(n) = a(n-2) + a(n-3) - [a(n-4)/2] - [a(n-6)/2]. 0
1, 1, 1, 2, 2, 3, 4, 4, 6, 6, 7, 9, 8, 11, 11, 12, 15, 14, 18, 18, 20, 23, 22, 27, 26, 29, 32, 31, 37, 36, 39, 44, 41, 50, 48, 51, 59, 52, 66, 61, 65, 76, 64, 85, 75, 81, 96, 76, 108, 90, 99 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

The a(n+1)/a(n) ratio is chaotic as is the later part of the sequence.

LINKS

Table of n, a(n) for n=0..50.

FORMULA

a(n)=a(n-2)+a(n-3)-Floor[a(n-4)/2]-Floor[a(n-6)/2]

MATHEMATICA

f[-4] = 0; f[-3] = 0; f[-2] = 0; f[-1] = 0; f[0] = 1; f[1] = 1;

f[n_] := f[n] = f[n - 2] + f[n - 3] - Floor[f[n - 4]/2] - Floor[f[n - 6]/2]

Table[f[n], {n, 0, 50}]

CROSSREFS

Sequence in context: A126246 A173633 A138369 * A138374 A029936 A114093

Adjacent sequences:  A173329 A173330 A173331 * A173333 A173334 A173335

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Nov 22 2010

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 17 17:12 EST 2019. Contains 320222 sequences. (Running on oeis4.)