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A057914
as a simple table
n
a(n)
1
0
2
1
3
2
4
6
5
7
6
26
7
35
8
50
9
115
10
171
11
204
12
219
13
362
14
644
15
1959
16
4427
17
5406
18
8030
19
10755
20
67826
[0,1,2,6,7,26,35,50,115,171,204,219,362,644,1959, 4427,5406,8030,10755,67826]