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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A171309 Number of 0..3 integer arrays v[1..n] of length n with all autocorrelation values sum(i){v[i]*v[i-k]} distinct for k in 0..n-1 0
4, 15, 53, 138, 483, 1678, 5634, 18915, 62325, 204315, 683210, 2277118, 7559559, 25132611, 83206528, 274465209, 907716605, 3004041236, 9908081432 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

column 4 of A171307.

LINKS

Table of n, a(n) for n=1..19.

CROSSREFS

Sequence in context: A057332 A230623 A162978 * A210781 A303271 A289802

Adjacent sequences:  A171306 A171307 A171308 * A171310 A171311 A171312

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 06 2009

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 December 11 21:00 EST 2019. Contains 329937 sequences. (Running on oeis4.)