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A213949
as a simple table
n
a(n)
1
1
2
4
3
10
4
18
5
36
6
57
7
77
8
110
9
141
10
177
11
232
12
270
13
337
14
402
15
453
16
566
17
610
18
721
[1,4,10,18,36,57,77,110,141,177,232,270,337,402, 453,566,610,721]