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A299017
as a simple table
n
a(n)
1
1
2
3
3
6
4
10
5
21
6
36
7
55
8
78
9
105
10
136
11
171
12
210
13
253
14
300
15
351
[1,3,6,10,21,36,55,78,105,136,171,210,253,300,351]