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A160803
First differences of A160802.
4
1, 2, 4, 4, 4, 6, 4, 3, 2, 3, 4, 1, 2, 3, 2, 2, 4, 6, 5, 3, 5, 5, 2, 2, 2, 2, 3, 4, 3, 2, 3, 4, 4, 5, 8, 8, 4, 1, 2, 3, 3, 4, 7, 8, 5, 4, 7, 9, 10, 15, 22, 12, 7, 2, 2, 3, 4, 5, 6, 7, 6, 5, 7, 10, 13, 16, 18, 9, 8, 3, 3, 6, 9, 8, 7
OFFSET
1,2
COMMENTS
Number of toothpicks added to the spiral at the n-th stage.
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.]
KEYWORD
nonn
AUTHOR
Omar E. Pol, May 26 2009
EXTENSIONS
Terms after a(12) from Nathaniel Johnston, Mar 30 2011
STATUS
approved