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A178573
Number of exposed endpoints in the toothpick structure of A182840.
0
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
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
KEYWORD
nonn
AUTHOR
Olaf Voß, Dec 24 2010
STATUS
approved