A233760 Number of toothpicks and D-toothpicks after n-th stage in the D-toothpick "wide" triangle of the third kind, second version.

0, 1, 3, 5, 9, 11, 15, 21, 29, 31, 35, 41, 53, 67, 79, 93, 109, 111, 115, 121, 133, 147, 167, 189, 215, 237, 249, 267, 299, 337, 365, 395, 427, 429, 433, 439, 451, 465, 485, 507, 533, 555, 575, 605, 649, 711, 763, 809, 863, 901, 913, 931, 967, 1013

Offset

0,3

Comments

The structure is essentially the same as A220520 but here the borders do not contain toothpicks with exposed endpoints except the initial toothpick. The structure is one of the oblique wedges of several D-toothpick structures. For more information see A220500. The first differences (A233761) give the number of toothpicks or D-toothpicks added at n-th stage.

Links

Table of n, a(n) for n=0..53.

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, A220500, A220520, A233761, A233762, A233780.

Sequence in context: A233780 A233970 A169780 * A244780 A024903 A322957

Adjacent sequences: A233757 A233758 A233759 * A233761 A233762 A233763

Keyword

nonn

Author

Omar E. Pol, Dec 16 2013

Status

approved