A233763 - OEIS

A233763

Number of toothpicks or D-toothpicks added at n-th stage in the structure of the D-toothpick "narrow" triangle of A233762.

0, 1, 2, 2, 4, 2, 4, 5, 8, 2, 4, 6, 12, 6, 8, 11, 16, 2, 4, 6, 12, 14, 16, 18, 24, 10, 8, 14, 28, 14, 16, 23, 32, 2, 4, 6, 12, 14, 16, 20, 32, 24, 20, 22, 40, 30, 40, 39, 48, 18, 8

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

OFFSET

0,3

COMMENTS

Essentially the first differences of A233762.

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

FORMULA

a(2n) = A220523(2n); a(2n+1) = A220523(2n+1) - 2.

EXAMPLE

Written as an irregular triangle in which the row lengths is A011782 the sequence (starting from 1) begins:

2,4;

2,4,5,8;

2,4,6,12,6,8,11,16;

2,4,6,12,14,16,18,24,10,8,14,28,14,16,23,32;

2,4,6,12,14,16,20,32,24,20,22,40,30,40,39,48,18,8,...

Right border gives A000079.

CROSSREFS

Cf. A000079, A011782, A139251, A220501, A220523, A233761, A233762.

Sequence in context: A060609 A330882 A205138 * A109526 A309894 A331118

Adjacent sequences: A233760 A233761 A233762 * A233764 A233765 A233766

KEYWORD

nonn,tabf,more

AUTHOR

Omar E. Pol, Dec 15 2013

STATUS

approved