A210985 Number of segments needed to draw the toothpick structure of A139250 as it is after 2^n stages.

1, 3, 7, 19, 63, 235, 919, 3651, 14575

Offset

0,2

Comments

It appears that this is also the partial sums of A039301.

It appears that this is also 1 together with A160128.

Links

Table of n, a(n) for n=0..8.

David Applegate, The movie version

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Formula

a(n) = A139252(2^n).

Example

For n = 3, after 2^3 stages the toothpick structure of A139250 contains 43 toothpicks (A139250(2^3) = 43). However the toothpick structure can be essentially represented by 19 segments (A139252(2^3) = 19), so a(3) = 19.

Crossrefs

Cf. A007583, A039301, A139250, A139252, A147614, A160128.

Sequence in context: A148669 A249380 A364626 * A160128 A051139 A049423

Adjacent sequences: A210982 A210983 A210984 * A210986 A210987 A210988

Keyword

nonn,more

Author

Omar E. Pol, Sep 11 2012

Status

approved