This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A172309 Number of L-toothpicks added to the L-toothpick structure of A172308 (First quadrant) at the n-th stage. 6
 0, 1, 2, 2, 2, 4, 4, 2, 4, 6, 6, 8, 6, 12, 10, 6, 4, 6, 10, 12, 10, 14, 14, 16, 16, 18, 14, 16, 12, 20, 22, 8, 8, 16, 18, 16, 10, 16, 20, 24, 26, 36, 24, 32, 30, 40, 28, 24 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 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 FORMULA a(0) = 0, a(n) = A172305(n+1)/4, for n>=1. CROSSREFS Cf. First differences of A172308. Cf. A139250, A139251, A152978, A172304, A172305, A172306, A172307, A172308, A172310, A172311, A172312, A172313. Sequence in context: A105080 A206424 A117728 * A130453 A259981 A070705 Adjacent sequences:  A172306 A172307 A172308 * A172310 A172311 A172312 KEYWORD more,nonn AUTHOR Omar E. Pol, Feb 06 2010 EXTENSIONS More terms from Colin Barker, Apr 19 2015 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 October 14 00:30 EDT 2019. Contains 327991 sequences. (Running on oeis4.)