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A220523 Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A220522. 7
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 14 22:42 EST 2019. Contains 329987 sequences. (Running on oeis4.)