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

Author

Omar E. Pol, Sep 11 2012

Keywords

• nonn
• more

Comments

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

It appears that this is also 1 together with A160128.

Examples

			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.
		

Links

• David Applegate, The movie version
• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Crossrefs

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

Formula

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