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A247662
as a simple table
n
a(n)
0
1
1
1
2
3
3
6
4
12
5
21
6
37
7
60
8
99
9
156
10
244
11
371
12
561
13
829
14
1218
15
1763
16
2532
17
3594
18
5068
19
7075
20
9819
[1,1,3,6,12,21,37,60,99,156,244,371,561,829,1218, 1763,2532,3594,5068,7075,9819]