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 A160409 First differences of toothpick numbers A160408. 5
 1, 1, 2, 4, 4, 4, 4, 4, 8, 16, 16, 8, 4, 4, 8 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Number of toothpick added to the toothpick pyramid at the round n. See also the toothpick sequences A139250, A160160 and the toothpick triangle A160406. 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 EXAMPLE Contribution from Omar E. Pol, Jun 06 2009: (Start) Array begins: ======== x, y, z ======== 1, 1, 2; 4, 4, 4; 4, 4, 8; 16, 16, 8; 4, 4, 8; (End) CROSSREFS Cf. A139250, A139251, A160160, A160161, A160406, A160407, A160408. Sequence in context: A159461 A046930 A302254 * A035645 A063440 A008497 Adjacent sequences:  A160406 A160407 A160408 * A160410 A160411 A160412 KEYWORD more,nonn AUTHOR Omar E. Pol, May 23 2009 EXTENSIONS More terms from Omar E. Pol, Jun 06 2009 STATUS approved

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Last modified June 20 11:37 EDT 2019. Contains 324234 sequences. (Running on oeis4.)