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

Author

Omar E. Pol, Dec 16 2013

Keywords

• nonn

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

• 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.