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 A162777 a(n) = A153003(n)-A153006(n). 1
 0, 0, 1, 1, 1, 3, 5, 3, 1, 3, 5, 5, 7, 13, 15, 7, 1, 3, 5, 5, 7, 13, 15, 9, 7, 13, 17, 19, 29, 43, 39, 15, 1, 3, 5, 5, 7, 13, 15, 9, 7, 13, 17, 19, 29, 43, 39, 17, 7, 13 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,6 COMMENTS The main entry for this sequence is the toothpick sequence A139250. 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 FORMULA Observation: It appears that a(2^i)=1, i>0 and a(2^i-1)=2^(i-1)-1, i>0. EXAMPLE If written as a triangle: 0; 0; 1,1; 1,3,5,3; 1,3,5,5,7,13,15,7; 1,3,5,5,7,13,15,9,7,13,17,19,29,43,39,15; ... Rows converge to A162779. CROSSREFS Cf. A139250, A152980, A153003, A153004, A153006, A162779. Sequence in context: A243533 A239730 A287765 * A241014 A173454 A023505 Adjacent sequences:  A162774 A162775 A162776 * A162778 A162779 A162780 KEYWORD more,nonn,tabf AUTHOR Omar E. Pol, Jul 23 2009 STATUS approved

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Last modified January 16 11:32 EST 2019. Contains 319188 sequences. (Running on oeis4.)