A178573 Number of exposed endpoints in the toothpick structure of A182840.

2, 4, 8, 8, 8, 12, 20, 16, 8, 12, 24, 32, 28, 28, 44, 32, 8, 12, 24, 32, 32, 40, 64, 72, 44, 28, 56, 84, 80, 72, 100, 64, 8, 12, 24, 32, 32, 40, 64, 72, 48, 40, 72, 112, 120, 112, 144, 152, 76, 28, 56, 84

Offset

1,1

Links

Table of n, a(n) for n=1..52.

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Olaf Voß, Toothpick structures on hexagonal net

Index entries for sequences related to toothpick sequences

Example

At stage 1 we place a toothpick anywhere in the plane (for example, in vertical position). There are two exposed endpoints, so a(1)=2.
At stage 2 we place 4 toothpicks: two new toothpicks touching each exposed endpoint. There are now 4 exposed endpoints, so a(2)=4.

Crossrefs

Sequence in context: A160161 A129279 A008496 * A162794 A172305 A366569

Adjacent sequences: A178570 A178571 A178572 * A178574 A178575 A178576

Keyword

nonn

Author

Olaf Voß, Dec 24 2010

Status

approved