A220523 Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A220522.

0, 1, 2, 4, 4, 4, 4, 7, 8, 4, 4, 8, 12, 8, 8, 13, 16, 4, 4, 8, 12, 16, 16, 20, 24, 12, 8, 16, 28, 16, 16, 25, 32, 4, 4, 8, 12, 16, 16, 22, 32, 26, 20, 24, 40, 32, 40, 41, 48, 20, 8

Offset

0,3

Comments

Essentially the first differences of A220522. First differs from A194443 at a(47).

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

Example

Written as an irregular triangle begins:
0;
1;
2;
4,4;
4,4,7,8;
4,4,8,12,8,8,13,16;
4,4,8,12,16,16,20,24,12,8,16,28,16,16,25,32;
4,4,8,12,16,16,22,32,26,20,24,40,32,40,41,48,20,8,...

Crossrefs

Cf. A139250, A139251, A194441, A194443, A194445, A220521, A220522.

Sequence in context: A008497 A220497 A194443 * A220527 A183226 A235863

Adjacent sequences: A220520 A220521 A220522 * A220524 A220525 A220526

Keyword

nonn,more

Author

Omar E. Pol, Dec 15 2012

Status

approved