A253771 First differences of A253770.

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

Offset: 0

Author

Omar E. Pol, Jan 13 2015

Keywords

• nonn
• tabf

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.

Examples

			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,...
		

Links

• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
• Index entries for sequences related to cellular automata

Crossrefs

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

Formula

a(n) = 6*A160121(n).