A222177 Number of pentagons added at n-th stage to the structure of A222176.

0, 1, 2, 2, 2, 4, 6, 4, 2, 4, 8, 8, 6, 10, 14, 8, 2, 4, 8, 12, 16

Offset

0,3

Comments

Essentially the first differences of A222176.

Also number of P-toothpicks added at n-th stage to the P-toothpick structure of A222176.

First differs from A152968 at a(10).

Links

Table of n, a(n) for n=0..20.

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) = A222181(n+1)/5, n >= 1.

Example

Apparently this is an irregular triangle:
0;
1;
2, 2;
2, 4, 6, 4;
2, 4, 8, 8, 6, 10, 14, 8;
2, 4, 8, 12, 16,...

Crossrefs

Cf. A139251, A152968, A222173, A222176, A222180, A222181.

Sequence in context: A278501 A278231 A152968 * A342271 A240433 A217637

Adjacent sequences: A222174 A222175 A222176 * A222178 A222179 A222180

Keyword

nonn,tabf,more

Author

Omar E. Pol, Mar 21 2013

Status

approved