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A173069
a(n) = A139251(n) - A105321(n).
1
-1, -2, -2, -2, -2, -2, 0, 0, -2, -2, 0, 0, 0, 4, 12, 8, -2, -2, 0, 0, 0, 4, 12, 8, 0, 4, 12, 12, 16, 36, 56, 32, -2, -2, 0, 0, 0, 4, 12, 8, 0, 4, 12, 12, 16, 36, 56, 32, 0, 4, 12, 12, 16, 36, 56, 36, 16, 36, 60, 64, 92, 160, 192, 96, -2, -2, 0, 0, 0, 4, 12, 8, 0, 4, 12
OFFSET
0,2
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.]
CROSSREFS
KEYWORD
sign
AUTHOR
Omar E. Pol, May 29 2010
EXTENSIONS
More terms from Nathaniel Johnston, Nov 15 2010
STATUS
approved