

A267694


Qtoothpick sequence in the first quadrant starting with two Qtoothpicks centered at (1,1). The endpoints of the left hand Qtoothpick are at (0,1) and (1,2). The endpoints of the right hand Qtoothpick are at (1,0) and (2,1). With a(0) = 0.


4



0, 2, 5, 9, 16, 20, 27, 39, 54, 58, 65, 77, 92, 104, 127, 163, 194, 198, 205, 217, 232, 244, 267, 303, 334, 346
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OFFSET

0,2


COMMENTS

a(n) is the total number of Qtoothpicks in the structure after nth stage.
A267695 (the first differences) gives the number of Qtoothpicks added at nth stage.
a(n) is also the total number of Qtoothpicks minus 1 after n+2 stages in the SW quadrant of the Qtoothpick structure of A187210, but with origing at (1,1) instead (0,0), and assuming that the initial Qtoothpick is in the first quadrant with origin at (0,0), if n>=1 . For more information see the comments and the formula of A187210.


LINKS

Table of n, a(n) for n=0..25.
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to cellular automata
Index entries for sequences related to toothpick sequences


CROSSREFS

Cf. A139250, A187210, A187220, A267695, A267698.
Sequence in context: A274355 A054253 A045649 * A024519 A160664 A072829
Adjacent sequences: A267691 A267692 A267693 * A267695 A267696 A267697


KEYWORD

nonn,more


AUTHOR

Omar E. Pol, Jan 23 2016


STATUS

approved



