login
A173532
a(n) = A173531(n) - A139251(n).
2
0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 4, 4, 0, 4, 32, 0, 0, 0, 4, 4, 0, 4, 32, 12, 0, 4, 28, 24, 4, 40, 176, 0, 0, 0, 4, 4, 0, 4, 32, 12, 0, 4, 28, 24, 4, 40, 176, 28, 0, 4, 28, 24, 4, 40, 172, 72, 4, 36, 144, 116, 48, 256, 832, 0, 0, 0, 4, 4, 0, 4, 32, 12, 0, 4
OFFSET
0,8
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.]
EXAMPLE
If written as a triangle, begins:
0;
0;
0,0;
0,0,0,4;
0,0,0,4,4,0,4,32;
0,0,0,4,4,0,4,32,12,0,4,28,24,4,40,176;
0,0,0,4,4,0,4,32,12,0,4,28,24,4,40,176,28,0,4,28,24,4,40,172,72,4,36,144,116,48,256,832;
CROSSREFS
KEYWORD
nonn
AUTHOR
Omar E. Pol, Oct 10 2010
STATUS
approved