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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A170889 First differences of toothpick sequence A170888. 4
0, 1, 2, 4, 4, 4, 6, 10, 8, 4, 6, 10, 10, 12, 20, 26, 16, 4, 6, 10, 10, 12, 20, 26, 18, 12, 20, 28, 30, 42, 64, 66, 32, 4, 6, 10, 10, 12, 20, 26, 18, 12, 20, 28, 30, 42, 64, 66, 34, 12, 20, 28, 30, 42, 64, 68, 46, 42, 66, 84, 100, 146, 192, 162, 64, 4, 6, 10, 10, 12, 20, 26, 18, 12 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..73.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

EXAMPLE

From Omar E. Pol, Jan 30 2013 (Start):

Written as an irregular triangle:

0;

1;

2;

4,4;

4,6,10,8;

4,6,10,10,12,20,26,16;

4,6,10,10,12,20,26,18,12,20,28,30,42,64,66,32;

4,6,10,10,12,20,26,18,12,20,28,30,42,64,66,34,12,20,28,30,42,64,68,46,42,66,84,100,146,192,162,64;

(End)

CROSSREFS

Cf. A139250, A139251, A160407, A170887, A170888, A170891, A170893.

Sequence in context: A201629 A033827 A008217 * A182839 A043552 A035545

Adjacent sequences:  A170886 A170887 A170888 * A170890 A170891 A170892

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Jan 09 2010

EXTENSIONS

Terms beyond a(10) from R. J. Mathar, Jan 25 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 January 23 04:40 EST 2019. Contains 319370 sequences. (Running on oeis4.)