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A069695
as a simple table
n
a(n)
1
0
2
1
3
3
4
6
5
10
6
15
7
21
8
28
9
36
10
45
11
55
12
66
13
78
14
91
15
136
16
231
17
435
18
630
19
333336
[0,1,3,6,10,15,21,28,36,45,55,66,78,91,136,231, 435,630,333336]