

A172309


Number of Ltoothpicks added to the Ltoothpick structure of A172308 (First quadrant) at the nth 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
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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



