A222181 Number of pentagons added at n-th stage to the structure of A222180.

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

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