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A210985
Number of segments needed to draw the toothpick structure of A139250 as it is after 2^n stages.
1
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.
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
KEYWORD
nonn,more
AUTHOR
Omar E. Pol, Sep 11 2012
STATUS
approved