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A253771 First differences of A253770. 2
0, 6, 18, 18, 54, 18, 54, 54, 126, 54, 54, 54, 126, 90, 126, 162, 306, 162, 54, 54, 126, 90, 126, 162, 306, 198, 126, 162, 306, 306, 342, 414, 702, 486, 126, 54, 126, 90, 126, 162, 306, 198, 126, 162, 306, 306, 342, 414, 702, 522, 198, 162 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Number of cells turned "ON" at n-th stage of cellular automaton of A253770.

Also 6 times the number of Y-toothpicks added at n-th stage in the Y-toothpick structure of A160120.

LINKS

Table of n, a(n) for n=0..51.

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) = 6*A160121(n).

EXAMPLE

Positive terms can be written as a triangle in which row lengths is A011782 as shown below:

6;

18;

18,  54;

18,  54,54,126;

54,  54,54,126,90,126,162,306;

162, 54,54,126,90,126,162,306,198,126,162,306,306,342,414,702;

486,126,54,126,90,126,162,306,198,126,162,306,306,342,414,702,522,198,162,...

CROSSREFS

Cf. A139251, A147582, A151724, A160121, A161645, A182633, A250301, A253770.

Sequence in context: A174904 A074390 A255617 * A223218 A045857 A074791

Adjacent sequences:  A253768 A253769 A253770 * A253772 A253773 A253774

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, Jan 13 2015

STATUS

approved

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Last modified October 20 05:42 EDT 2017. Contains 293601 sequences.