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%I #4 Dec 22 2013 00:00:13
%S 1,1,2,1,2,3,4,1,2,3,5,5,4,7,8,1,2,3,5,5,5,9,12,11,4,7,11,13,8,15,16,
%T 1,2,3,5,5,5,9,12,11,5,9,14,19,14,23,28,27,4,7,11,13,11,21,28,31,8,15,
%U 23,29,16,31,32,1,2,3,5,5,5,9,12,11,5,9,14
%N a(n) = A233971(n+1)/2.
%H 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>
%H <a href="/index/To#toothpick">Index entries for sequences related to toothpick sequences</a>
%e Written as an irregular triangle in which row lengths is A000079 the sequence begins:
%e 1,
%e 1,2,
%e 1,2,3,4,
%e 1,2,3,5,5,4,7,8,
%e 1,2,3,5,5,5,9,12,11,4,7,11,13,8,15,16,
%e 1,2,3,5,5,5,9,12,11,5,9,14,19,14,23,28,27,4,7,11,13,11,21, 28,31,8,15,23,29,16,31,32;
%Y Right border gives A000079.
%Y Cf. A139251, A233782, A233970, A233971.
%K nonn,tabf
%O 1,3
%A _Omar E. Pol_, Dec 18 2013
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