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A175099 Number of closed rectangles added at the n-th stage of the leftist toothpicks A151566. 1
0, 0, 0, 0, 1, 0, 0, 2, 3, 0, 0, 2, 2, 0, 0, 4, 7, 0, 0, 2, 2, 0, 0, 4, 6, 0, 0, 4, 4, 0, 0, 8, 15, 0, 0, 2, 2, 0, 0, 4, 6, 0, 0, 4, 4, 0, 0, 8, 14, 0, 0, 4, 4, 0, 0, 8, 12, 0, 0, 8, 8, 0, 0, 16, 31, 0, 0, 2, 2, 0, 0, 4, 6, 0, 0, 4, 4, 0, 0, 8, 14, 0, 0, 4, 4, 0, 0, 8, 12, 0, 0, 8, 8, 0, 0, 16, 30, 0, 0, 4, 4, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,8

LINKS

Table of n, a(n) for n=0..101.

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

For a recurrence see A160018. - N. J. A. Sloane, Feb 07 2010

CROSSREFS

Cf. A160125, A175098

Sequence in context: A078332 A097109 A160018 * A151867 A262563 A170843

Adjacent sequences:  A175096 A175097 A175098 * A175100 A175101 A175102

KEYWORD

nonn

AUTHOR

R. J. Mathar, Feb 04 2010

STATUS

approved

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Last modified January 19 03:18 EST 2019. Contains 319282 sequences. (Running on oeis4.)