A220512 D-toothpick sequence of the third kind starting with a cross formed by 4 toothpicks.

0, 4, 12, 28, 44, 60, 88, 136, 168, 184, 216, 280, 344, 424, 508, 620, 684, 700, 732, 796, 892, 1004, 1148, 1324, 1460, 1572, 1668, 1844, 2020, 2228, 2424, 2664, 2792, 2808, 2840, 2904, 3000, 3112, 3264

Offset

0,2

Comments

This is a toothpick sequence of forking paths to 135 degrees. The sequence gives the number of toothpicks and D-toothpicks in the structure after n-th stage. A221565 (the first differences) give the number of toothpicks or D-toothpicks added at n-th stage. It appears that the structure has a fractal (or fractal-like) behavior. For more information see A194700.

First differs from A194432 at a(14).

Links

Table of n, a(n) for n=0..38.

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, A194270, A194432, A194700, A220500, A220514, A220520, A220522, A220524, A220526.

Sequence in context: A009906 A357719 A194432 * A194434 A220514 A301005

Adjacent sequences: A220509 A220510 A220511 * A220513 A220514 A220515

Keyword

nonn,more

Author

Omar E. Pol, Dec 15 2012

Status

approved