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

1,4

Comments

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

Links

Table of n, a(n) for n=1..72.

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

Index entries for sequences related to toothpick sequences

Formula

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

Crossrefs

Cf. A139250, A139251, A161330, A211964.

Sequence in context: A280253 A008677 A036497 * A035460 A261679 A147657

Adjacent sequences: A211973 A211974 A211975 * A211977 A211978 A211979

Keyword

nonn

Author

Omar E. Pol, Dec 15 2012

Status

approved