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A172309 Number of L-toothpicks added to the L-toothpick structure of A172308 (First quadrant) at the n-th stage. 6
0, 1, 2, 2, 2, 4, 4, 2, 4, 6, 6, 8, 6, 12, 10, 6, 4, 6, 10, 12, 10, 14, 14, 16, 16, 18, 14, 16, 12, 20, 22, 8, 8, 16, 18, 16, 10, 16, 20, 24, 26, 36, 24, 32, 30, 40, 28, 24 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..47.

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

FORMULA

a(0) = 0, a(n) = A172305(n+1)/4, for n>=1.

CROSSREFS

Cf. First differences of A172308.

Cf. A139250, A139251, A152978, A172304, A172305, A172306, A172307, A172308, A172310, A172311, A172312, A172313.

Sequence in context: A105080 A206424 A117728 * A130453 A259981 A070705

Adjacent sequences:  A172306 A172307 A172308 * A172310 A172311 A172312

KEYWORD

more,nonn

AUTHOR

Omar E. Pol, Feb 06 2010

EXTENSIONS

More terms from Colin Barker, Apr 19 2015

STATUS

approved

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Last modified October 15 16:14 EDT 2018. Contains 316236 sequences. (Running on oeis4.)