

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
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OFFSET

0,3


COMMENTS

The sequence gives the number of cells turned "ON" at the nth 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), 157191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n1)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



