A299478 Toothpick sequence on triangular grid with word "abcbc".

0, 1, 3, 7, 13, 21, 27, 33, 43, 59, 79, 91, 101, 117, 137, 169, 193, 215, 249, 285, 325, 341, 355, 375, 399, 439, 471, 503, 547, 595, 659, 707, 749, 807, 877, 981, 1055, 1115, 1193, 1271, 1351, 1375, 1389, 1409, 1433, 1473, 1509, 1549, 1599, 1651, 1723

Offset

0,3

Comments

a(n) gives the number of toothpicks of length 2 in the structure after n-th stage.

A299479 (the first differences) gives the number of toothpicks added at n-th stage.

For more information about the "word" of a cellular automaton see A296612.

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 cellular automata

Index entries for sequences related to toothpick sequences

Crossrefs

Cf. A299479 (first differences).

Cf. A160120 (word "a"), A139250 (word "ab"), A296510 (word "abc"), A299476 (word "abcb").

Sequence in context: A100531 A032409 A073896 * A355310 A299476 A077853

Adjacent sequences: A299475 A299476 A299477 * A299479 A299480 A299481

Keyword

nonn,more

Author

Omar E. Pol, Feb 11 2018

Status

approved