

A172304


Ltoothpick sequence starting with two opposite Ltoothpicks.


7



0, 2, 6, 14, 22, 30, 46, 62, 70, 86, 110, 134, 166, 190, 238, 278, 302, 318, 342, 382, 430, 470, 526, 582, 646, 710, 782, 838, 902, 950, 1030, 1118, 1150, 1182, 1246, 1318, 1382, 1422, 1486, 1566, 1662, 1766, 1910, 2006, 2134, 2254, 2414, 2526, 2622
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OFFSET

0,2


COMMENTS

The same as A172310 but starting with two Ltoothpicks.
We start at stage 0 with no Ltoothpicks.
At stage 1 we place two large Ltoothpicks in the horizontal direction, as a "X", anywhere in the plane.
At stage 2 we place four small Ltoothpicks.
At stage 3 we add eight more large Ltoothpicks.
At stage 4 we add eight more small Ltoothpicks.
And so on...
The sequence gives the number of Ltoothpicks after n stages. A172305 (the first differences) gives the number of Ltoothpicks added at the nth stage.


LINKS

Yan Sheng Ang, Table of n, a(n) for n = 0..201
David Applegate, The movie version
David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS


CROSSREFS

Cf. A139250, A160120, A160170, A160172, A161206, A161328, A172305, A172306, A172307, A172308, A172309, A172310, A172311, A172312, A172313.
Sequence in context: A228649 A268641 A162796 * A160164 A074729 A099901
Adjacent sequences: A172301 A172302 A172303 * A172305 A172306 A172307


KEYWORD

nonn


AUTHOR

Omar E. Pol, Feb 06 2010


EXTENSIONS

Terms beyond a(14) from Yan Sheng Ang, Dec 10 2012


STATUS

approved



