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A033194
as a simple table
n
a(n)
2
3
3
6
4
26
5
136
6
925
7
5672
8
35526
9
228565
10
1500561
11
9996073
12
67585035
13
462763757
14
3200969510
15
22338048739
[3,6,26,136,925,5672,35526,228565,1500561,9996073, 67585035,462763757,3200969510,22338048739]