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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

Table of n, a(n) for n=0..47.

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

Index entries for sequences related to cellular automata

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 March 21 22:19 EDT 2019. Contains 321382 sequences. (Running on oeis4.)