1,2

Triangle A163311 by diagonals = the infinite set of Toothpick sequences.

Table of n, a(n) for n=1..14.

David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

a(n) = sum of n-th row terms, triangle A163311

a(4) = 17 = (1, + 4 + 7, + 5).

A163311

Sequence in context: A002626 A029859 A305105 * A131253 A145071 A182734

Adjacent sequences: A163309 A163310 A163311 * A163313 A163314 A163315

nonn

Gary W. Adamson, Jul 24 2009

approved