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A172304 L-toothpick sequence starting with two opposite L-toothpicks. 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The same as A172310 but starting with two L-toothpicks.

We start at stage 0 with no L-toothpicks.

At stage 1 we place two large L-toothpicks in the horizontal direction, as a "X", anywhere in the plane.

At stage 2 we place four small L-toothpicks.

At stage 3 we add eight more large L-toothpicks.

At stage 4 we add eight more small L-toothpicks.

And so on...

The sequence gives the number of L-toothpicks after n stages. A172305 (the first differences) gives the number of L-toothpicks added at the n-th 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

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Last modified October 16 23:12 EDT 2018. Contains 316275 sequences. (Running on oeis4.)