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 A266533 First differences of A266532. 2
 1, 3, 3, 9, 3, 9, 9, 21, 3, 9, 9, 21, 9, 21, 21, 45, 3, 9, 9, 21, 9, 21, 21, 45, 9, 21, 21, 45, 21, 45, 45, 93, 3, 9, 9, 21, 9, 21, 21, 45, 9, 21, 21, 45, 21, 45, 45, 93, 9, 21, 21, 45, 21, 45, 45, 93, 21, 45, 45, 93, 45, 93, 93, 189, 3, 9, 9, 21, 9, 21, 21, 45, 9, 21, 21, 45, 21, 45, 45, 93 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Number of Y-toothpicks added at n-th stage in the structure of A266532. A simplified version of A160121. LINKS David Applegate, The movie version N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS FORMULA a(1) = 1. It appears that a(n) = 3*A038573(n-1), n >= 2. EXAMPLE Written as an irregular triangle in which the row lengths are the terms of A011782 the sequence begins: 1; 3; 3, 9; 3, 9, 9, 21; 3, 9, 9, 21, 9, 21, 21, 45; 3, 9, 9, 21, 9, 21, 21, 45, 9, 21, 21, 45, 21, 45, 45, 93; ... Observation: at least the first 11 terms of the right border coincide with A068156. CROSSREFS Cf. A000120, A011782, A038573, A068156. A139251, A147582, A160121, A151710, A160721, A266532, A267701. Sequence in context: A145444 A165824 A256689 * A151710 A160121 A048883 Adjacent sequences:  A266530 A266531 A266532 * A266534 A266535 A266536 KEYWORD nonn,tabf AUTHOR David Applegate and Omar E. Pol, Jan 18 2016 STATUS approved

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Last modified July 20 14:09 EDT 2019. Contains 325181 sequences. (Running on oeis4.)