A194440 - OEIS

A194440

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

0, 1, 3, 7, 11, 15, 19, 27, 35, 39, 43, 51, 63, 79, 87, 103, 119, 123, 127, 135, 147, 163, 179, 203, 229, 253, 265, 285, 313, 353, 373, 405, 437, 441, 445, 453, 465, 481, 497, 521, 547, 571, 591, 623, 663, 727, 767, 815, 869, 909, 921, 941, 973, 1021

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

OFFSET

0,3

COMMENTS

For the D-toothpick "narrow" triangle of the second kind see A194442.

The structure is essentially one of the wedges of several D-toothpick structures. For more information see A194270. The first differences (A194441) give the number of toothpicks or D-toothpicks added at n-th stage. [Omar E. Pol, Dec 29 2012]

LINKS

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

Omar E. Pol, Illustration of the structure after 32 stages

Omar E. Pol, Illustration of the structure after 64 stages

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, A160120, A160406, A161830, A194270, A194277, A194441, A194442, A194444, A194692, A194693, A194696, A220494, A220520.

Sequence in context: A034934 A191151 A220494 * A220520 A330165 A228436

Adjacent sequences: A194437 A194438 A194439 * A194441 A194442 A194443

KEYWORD

nonn

AUTHOR

Omar E. Pol, Aug 29 2011

STATUS

approved