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A239698
as a simple table
n
a(n)
1
0
2
2
3
6
4
11
5
18
6
25
7
35
8
45
9
56
10
69
11
83
12
97
13
115
14
131
15
150
16
169
17
189
18
212
19
234
20
258
21
284
[0,2,6,11,18,25,35,45,56,69,83,97,115,131,150,169, 189,212,234,258,284]