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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
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.
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,...
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Jan 13 2015
STATUS
approved