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 A151922 Number of first-quadrant cells (including the two boundaries) that are "ON" after n-th stage of the Holladay-Ulam cellular automaton. 4
 1, 3, 5, 9, 11, 15, 19, 29, 31, 35, 39, 49, 53, 63, 73, 101, 103, 107, 111, 121, 125, 135, 145, 173, 177, 187, 197, 225, 235, 263, 291, 373, 375, 379, 383, 393, 397, 407, 417, 445, 449, 459, 469, 497, 507, 535, 563, 645 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS See A079314, the first differences and A147562, the main entry for this CA, for further information. 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(n) = A079316(2n). CROSSREFS Cf. A079314, A079316, A139250, A147562, A160406. Sequence in context: A002731 A006046 A161830 * A233762 A104635 A210537 Adjacent sequences:  A151919 A151920 A151921 * A151923 A151924 A151925 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, Aug 05 2009 EXTENSIONS Extended (a(30)-a(47)) and edited by Omar E. Pol, Nov 21 2010 STATUS approved

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Last modified September 19 21:11 EDT 2021. Contains 347564 sequences. (Running on oeis4.)