login
A170866
a(0) = 1, a(1) = 1; a(2^i + j) = 2a(j) + 3a(j + 1) for 0 <= j < 2^i.
0
1, 1, 5, 17, 5, 17, 61, 49, 5, 17, 61, 49, 61, 217, 269, 113, 5, 17, 61, 49, 61, 217, 269, 113, 61, 217, 269, 281, 773, 1241, 877, 241, 5, 17, 61, 49, 61, 217, 269, 113, 61, 217, 269, 281, 773, 1241, 877, 241, 61, 217, 269, 281, 773, 1241, 877, 409, 773, 1241, 1381, 2881, 5269
OFFSET
0,3
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
Sequence in context: A090592 A340706 A093558 * A337031 A125636 A355658
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 02 2010
STATUS
approved