Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
Number of toothpicks added to the spiral at the n-th stage.
Table of n, a(n) for n=1..73.
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
Cf. A000045, A139250, A139251, A160426, A160427, A160800.
Sequence in context: A059317 A220886 A087266 * A177002 A079046 A079045
Adjacent sequences: A160798 A160799 A160800 * A160802 A160803 A160804
Omar E. Pol, May 26 2009
Terms after a(32) from Nathaniel Johnston, Mar 30 2011