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

Author

Omar E. Pol, Mar 21 2013

Keywords

• nonn
• tabf
• more

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).

Examples

			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,...
		

Links

• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
• Index entries for sequences related to toothpick sequences

Crossrefs

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

Formula

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