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.

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

Offset: 0

Author

Omar E. Pol, Jan 23 2016

Keywords

• nonn
• more

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

• 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.