

A160731


First differences of A160730.


3



2, 2, 4, 6, 6, 6, 12, 14, 12, 6, 12, 14, 16, 18, 32, 34, 20, 6, 12, 14, 16, 18, 32, 34, 24, 18, 32, 38, 44, 62, 92, 82, 36, 6, 12, 14, 16, 18, 32, 34, 24, 18, 32, 38, 44, 62, 92, 82, 40, 18, 32, 38, 44, 62
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OFFSET

1,1


LINKS

Table of n, a(n) for n=1..54.
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

Contribution from Nathaniel Johnston, Mar 28 2011 (Start):
a(n) = 2*A168113(n)
a(2^(n+2) + 1) = 4(2^n + 1), n >= 1.
(End)


EXAMPLE

Placing the entries starting from a(4) in a triangle with rows that have length equal to powers of two gives:
6, 6
6, 12, 14, 12
6, 12, 14, 16, 18, 32, 34, 20
6, 12, 14, 16, 18, 32, 34, 24, 18, 32, 38, 44, 62, 92, 82, 36
...
The rows of this triangle tend to 2*A168114.


CROSSREFS

Cf. A139250, A139251, A160730, A160733, A160737, A160739, A160741.
Sequence in context: A045999 A075569 A062722 * A302928 A098214 A178883
Adjacent sequences: A160728 A160729 A160730 * A160732 A160733 A160734


KEYWORD

nonn


AUTHOR

Omar E. Pol, May 25 2009


EXTENSIONS

Terms after a(11) from Nathaniel Johnston, Mar 28 2011


STATUS

approved



