A182842 a(n) = A182841(n+2)/2.
2, 4, 7, 8, 7, 12, 19, 16, 7, 12, 23, 32, 27, 28, 43, 32, 7, 12, 23, 32, 31, 40, 63, 72, 43, 28, 55, 84, 79, 72, 99, 64, 7, 12, 23, 32, 31, 40, 63, 72, 47, 40, 71, 112, 119, 112, 143, 152, 75, 28, 55, 84, 91, 108, 163, 204, 151, 88, 131, 204, 207, 180, 219, 128
Offset: 0
Examples
From _Omar E. Pol_, Nov 01 2014: (Start) When written as an irregular triangle with row lengths A011782: 2; 4; 7, 8; 7, 12, 19, 16; 7, 12, 23, 32, 27, 28, 43, 32; 7, 12, 23, 32, 31, 40, 63, 72, 43, 28, 55, 84, 79, 72, 99, 64; 7, 12, 23, 32, 31, 40, 63, 72, 47, 40, 71, 112, 119, 112, 143, 152, 75, 28, 55, 84, 91, 108, 163, 204, 151, 88, 131, 204, 207, 180, 219, 128; The right border gives the even powers of 2, at least up a(2^9-1). (End)
Links
- Olaf Voß, Table of n, a(n) for n = 0..998
- 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.]
- N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
- Olaf Voß, Toothpick structures on hexagonal net
- Index entries for sequences related to toothpick sequences