cp's OEIS Frontend

A170903 a(n) = 2*A160552(n)-1.

%I A170903 #23 Feb 24 2021 02:48:19
%S A170903 1,1,5,1,5,9,13,1,5,9,13,9,21,33,29,1,5,9,13,9,21,33,29,9,21,33,37,41,
%T A170903 77,97,61,1,5,9,13,9,21,33,29,9,21,33,37,41,77,97,61,9,21,33,37,41,77,
%U A170903 97,69,41,77,105,117,161,253,257,125,1,5,9,13,9,21,33,29,9,21,33,37,41,77
%N A170903 a(n) = 2*A160552(n)-1.
%H A170903 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, 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.]
%H A170903 N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>
%F A170903 It appears that a(n) = A160164(n) - A169707(n). - _Omar E. Pol_, Feb 17 2015
%e A170903 When written as a triangle:
%e A170903 1
%e A170903 1, 5;
%e A170903 1, 5, 9, 13;
%e A170903 1, 5, 9, 13, 9, 21, 33, 29;
%e A170903 ...
%e A170903 Rows sums are A006516 (this is immediate from the definition).
%e A170903 From _Omar E. Pol_, Feb 17 2015: (Start)
%e A170903 Also, written as an irregular triangle in which the row lengths are the terms of A011782:
%e A170903 1;
%e A170903 1;
%e A170903 5,1;
%e A170903 5,9,13,1;
%e A170903 5,9,13,9,21,33,29,1;
%e A170903 5,9,13,9,21,33,29,9,21,33,37,41,77,97,61,1;
%e A170903 5,9,13,9,21,33,29,9,21,33,37,41,77,97,61,9,21,33,37,41,77,97,69,41,77,105,117,161,253,257,125,1;
%e A170903 Row sums give 1 together with the positive terms of A006516.
%e A170903 It appears that the right border (A000012) gives the smallest difference between A160164 and A169707 in every period.
%e A170903 (End)
%Y A170903 Cf. A006516, A139250, A139251, A160164, A160552, A169707.
%K A170903 nonn
%O A170903 1,3
%A A170903 _Gary W. Adamson_, Jan 21 2010