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A007687
as a simple table
n
a(n)
1
3
2
10
3
21
4
44
5
83
6
218
7
271
8
692
9
865
10
2622
11
2813
12
9220
13
9735
14
35214
15
35911
16
135564
17
136899
18
533290
19
535081
[3,10,21,44,83,218,271,692,865,2622,2813,9220, 9735,35214,35911,135564,136899,533290,535081]