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A222181 Number of pentagons added at n-th 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Essentially the first differences of A222180.

Also number of P-toothpicks added at n-th stage to the P-toothpick 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(n-2), 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

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Last modified June 16 21:13 EDT 2019. Contains 324155 sequences. (Running on oeis4.)