This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A162794 Number of toothpicks added to the toothpick structure A139250 at the n-th even round. 6
 0, 2, 4, 8, 8, 8, 12, 28, 16, 8, 12, 28, 20, 28, 40, 88, 32, 8, 12, 28, 20, 28, 40, 88, 36, 28, 40, 88, 56, 92, 140, 256, 64, 8, 12, 28, 20, 28, 40, 88, 36, 28, 40, 88, 56, 92, 140, 256, 68, 28, 40, 88, 56, 92, 140, 256, 88, 92, 140, 260, 172, 296, 488, 704, 128, 8, 12, 28, 20, 28 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Note that these toothpicks are orthogonal to the initial toothpick in the sieve. A bisection of A139251. 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 Cf. A139250, A139251, A159791, A159792, A162793, A162795, A162796, A162797. Sequence in context: A129279 A008496 A178573 * A172305 A187221 A129280 Adjacent sequences:  A162791 A162792 A162793 * A162795 A162796 A162797 KEYWORD nonn AUTHOR Omar E. Pol, Jul 14 2009 EXTENSIONS Extended by R. J. Mathar, Sep 27 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.

Last modified September 17 11:33 EDT 2019. Contains 327129 sequences. (Running on oeis4.)