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A267698 Q-toothpick sequence in the first quadrant starting with two Q-toothpicks centered at (1,3) and (3,1) respectively. The endpoints of the left hand Q-toothpick are at (0,3) and (1,4). The endpoints of the right hand Q-toothpick are at (3,0) and (4,1). With a(0) = 0. 4
0, 2, 6, 13, 25, 32, 44, 59, 79, 86, 98, 113, 133, 148, 176, 215, 251, 258, 270, 285, 305, 320, 348, 387, 423, 438 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(n) is the total number of Q-toothpicks in the structure after n-th stage.

A267699 (the first differences) gives the number of Q-toothpicks added at n-th stage.

Note that this sequence is also related with the structure and the formula of A187210. For more information see A187210, A267694 and A139250.

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, A267694, A267699.

Sequence in context: A283551 A000135 A281865 * A065220 A048094 A335439

Adjacent sequences:  A267695 A267696 A267697 * A267699 A267700 A267701

KEYWORD

nonn,more

AUTHOR

Omar E. Pol, Jan 23 2016

STATUS

approved

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Last modified July 11 20:03 EDT 2020. Contains 335652 sequences. (Running on oeis4.)