

A229951


Number of toothpicks added at nth stage to the toothpick structure of A229950.


5



0, 0, 0, 1, 0, 1, 0, 1, 0, 2, 1, 2, 0, 2, 1, 2, 0, 2, 1, 3, 1, 3, 2, 3, 0, 3, 2, 3, 1, 3, 1, 3, 1, 4, 3, 4, 1, 4, 3, 4, 1, 4, 2, 4, 2, 4, 3, 4, 0, 4, 3, 5, 3, 5, 3, 5, 2, 5, 4, 5, 1, 5, 4, 5, 2, 5, 3, 5, 3, 5, 3, 5, 1, 6, 5, 6, 4, 6, 4, 6, 2, 6, 5, 6, 2, 6, 5
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OFFSET

0,10


COMMENTS

Essentially the first differences of A229950.
Also [0, 0, 0] together the row sums of triangle A229940.
The toothpick structure has the property that the number of exposed endpoints in the row 2k equals the number of divisors of k, if 1<2k<n, k>=1. See example and Link section.


LINKS



EXAMPLE

Illustration of initial terms:


0 0
1 0
2 0 1
3 1 
4 0 2
5 1 
6 0 2
7 1 
8 0 3
9 2  
10 1  2
11 2  
12 0 4
13 2  
14 1  2
15 2  
16 0 4
17 2  
18 1  3
19 3   
20 1  4
21 3   
22 2   2
23 3   
24 0 6
25 3   
26 2   2
27 3   
28 1  4
29 3   
30 1  4
31 3   
32 1  5
33 4    
...


CROSSREFS



KEYWORD

nonn,tabf


AUTHOR



STATUS

approved



