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A323930
as a simple table
n
a(n)
1
1
2
1
3
3
4
7
5
22
6
81
7
331
8
1436
9
6510
10
30129
11
141512
12
671538
13
3210620
14
15443871
15
74662005
16
362506902
[1,1,3,7,22,81,331,1436,6510,30129,141512,671538, 3210620,15443871,74662005,362506902]