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 A161210 Toothpick sequence starting at the outside corner of an infinite cube from which protudes a half toothpick. 4
 0, 1, 3, 7, 14, 21, 28 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The sequence gives the number of toothpicks after n rounds. A161211 (the first differences) gives the number added at the n-th round. This structure is a three-dimensional version of the toothpick structure of A153006. Toothpicks are placed following a rotation of axes: x,y,z,x,y,z,... and so on. See A139250 and A160160 for more information about the toothpick sequences. LINKS David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.] N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS CROSSREFS Cf. A139250, A152980, A153006, A160160, A161211, A161212, A161214, A161216. Sequence in context: A310275 A310276 A310277 * A256059 A258434 A249341 Adjacent sequences:  A161207 A161208 A161209 * A161211 A161212 A161213 KEYWORD more,nonn AUTHOR Omar E. Pol, Jun 06 2009 STATUS approved

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Last modified January 21 17:07 EST 2019. Contains 319350 sequences. (Running on oeis4.)