A233762 - OEIS

A233762

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

0, 1, 3, 5, 9, 11, 15, 20, 28, 30, 34, 40, 52, 58, 64, 75, 91, 93, 97, 103, 115, 129, 145, 163, 187, 197, 205, 219, 247, 261, 277, 300, 332, 334, 338, 344, 356, 370, 386, 406, 438, 464, 484, 506, 546, 576, 616, 655, 703, 721, 729

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

The structure is essentially the same as A220522 but here the borders do not contain D-toothpicks with exposed endpoints except the initial D-toothpick. The structure is one of the oblique wedges of several D-toothpick structures. For more information see A220500. The first differences (A233763) give the number of toothpicks or D-toothpicks added at n-th stage.

LINKS

Table of n, a(n) for n=0..50.

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, A220522, A233760, A233763.

Sequence in context: A006046 A161830 A151922 * A104635 A210537 A199407

Adjacent sequences: A233759 A233760 A233761 * A233763 A233764 A233765

KEYWORD

nonn

AUTHOR

Omar E. Pol, Dec 15 2013

STATUS

approved