

A222181


Number of pentagons added at nth stage to the structure of A222180.


4



0, 1, 5, 10, 10, 10, 20, 30, 20, 10, 20, 40, 40, 30, 50, 70, 40, 10, 20, 40, 60, 80
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OFFSET

0,3


COMMENTS

Essentially the first differences of A222180.
Also number of Ptoothpicks added at nth stage to the Ptoothpick structure of A222180.


LINKS

Table of n, a(n) for n=0..21.
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences


FORMULA

a(n) = 10*A222173(n2), n >= 3.  Omar E. Pol, Nov 24 2013


EXAMPLE

Apparently this is an irregular triangle:
0;
1;
5;
10,10;
10,20,30,20;
10,20,40,40,30,50,70,40;
10,20,40,60,80,...


CROSSREFS

Cf. A139250, A139251, A147582, A151724, A152968, A161645, A182633, A182841, A222173, A222177, A222180.
Sequence in context: A135912 A200990 A040020 * A282172 A123337 A038671
Adjacent sequences: A222178 A222179 A222180 * A222182 A222183 A222184


KEYWORD

nonn,tabf,more


AUTHOR

Omar E. Pol, Mar 15 2013


STATUS

approved



