A211976 First differences of the E-toothpick sequence A211964.

1, 1, 1, 2, 1, 2, 2, 2, 3, 2, 3, 4, 1, 2, 2, 3, 5, 3, 7, 4, 5, 7, 4, 6, 7, 2, 4, 4, 5, 8, 6, 11, 8, 8, 9, 6, 7, 8, 8, 8, 5, 6, 10, 7, 11, 11, 9, 9, 12, 9, 14, 9, 10, 14, 11, 14, 10, 9, 9, 11, 16, 16, 13, 12, 11, 14, 14, 16, 17, 10, 10, 14

Offset: 1

Author

Omar E. Pol, Dec 15 2012

Keywords

• nonn

Comments

Number of E-toothpicks added at n-th stage to the triangular structure of A211964.

Links

• N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
• Index entries for sequences related to toothpick sequences

Crossrefs

Cf. A139250, A139251, A161330, A211964.

Formula

a(n) = ((A161331(n+1)/6) + 1)/2.