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A183061 First differences of A183060. 2
0, 1, 3, 3, 7, 3, 7, 7, 19, 3, 7, 7, 19, 7, 19, 19, 55, 3, 7, 7, 19, 7, 19, 19, 55, 7, 19, 19, 55, 19, 55, 55, 163, 3, 7, 7, 19, 7, 19, 19, 55, 7, 19, 19, 55, 19, 55, 55, 163, 7, 19, 19, 55, 19, 55, 55, 163, 19, 55, 55, 163, 55, 163, 163, 487, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

The sequence gives the number of cells turned "ON" at the n-th stage in the structure of A183060.

LINKS

Table of n, a(n) for n=0..65.

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) = 1 + A147582(n)/2.

a(n) = 1 + 2*A147610(n).

EXAMPLE

If written as a triangle begins:

0,

1,

3,

3,7,

3,7,7,19,

3,7,7,19,7,19,19,55,

3,7,7,19,7,19,19,55,7,19,19,55,19,55,55,163,

It appears that row sums give A007582.

It appears that last terms of rows give A100702.

CROSSREFS

Cf. A007582, A100702, A139250, A139251, A147582, A147610, A183060.

Sequence in context: A100803 A036840 A159913 * A172097 A193934 A030316

Adjacent sequences:  A183058 A183059 A183060 * A183062 A183063 A183064

KEYWORD

nonn

AUTHOR

Omar E. Pol, Feb 20 2011

STATUS

approved

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Last modified April 1 01:46 EDT 2020. Contains 333153 sequences. (Running on oeis4.)