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A119242
as a simple table
n
a(n)
0
1
1
2
2
5
3
31
4
234
5
1822
6
3611
7
17329
8
1511067
9
524827
10
180469424
11
472532614
12
78102676912
[1,2,5,31,234,1822,3611,17329,1511067,524827, 180469424,472532614,78102676912]