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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 N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS CROSSREFS Cf. A139250, A187210, A187220, A267694, A267699. Sequence in context: A003600 A000135 A281865 * A065220 A048094 A181522 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 December 19 06:03 EST 2018. Contains 318245 sequences. (Running on oeis4.)