This site is supported by donations to The OEIS Foundation.

 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!)
 A170868 a(0) = 1, a(1) = 2; a(2^i + j) = 3a(j) + a(j + 1) for 0 <= j < 2^i. 0
 1, 2, 5, 11, 5, 11, 26, 38, 5, 11, 26, 38, 26, 59, 116, 119, 5, 11, 26, 38, 26, 59, 116, 119, 26, 59, 116, 140, 137, 293, 467, 362, 5, 11, 26, 38, 26, 59, 116, 119, 26, 59, 116, 140, 137, 293, 467, 362, 26, 59, 116, 140, 137, 293, 467, 383, 137, 293, 488, 557, 704, 1346, 1763 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS 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 CROSSREFS Sequence in context: A246208 A286091 A127011 * A276736 A069162 A300677 Adjacent sequences:  A170865 A170866 A170867 * A170869 A170870 A170871 KEYWORD nonn AUTHOR N. J. A. Sloane, Jan 02 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.

Last modified December 8 18:37 EST 2019. Contains 329865 sequences. (Running on oeis4.)