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A030448
as a simple table
n
a(n)
1
0
2
1
3
2
4
33
5
260
6
2648
7
26105
8
267195
9
2755322
10
28744852
11
302092789
12
3196248508
13
34007055286
[0,1,2,33,260,2648,26105,267195,2755322,28744852, 302092789,3196248508,34007055286]