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A146468
as a simple table
n
a(n)
1
1
2
1
3
1
4
1
5
1
6
21
7
61
8
413
9
1837
10
12959
11
107653
12
1592585
13
19952617
14
467249637
15
9827027521
16
347403836941
[1,1,1,1,1,21,61,413,1837,12959,107653,1592585, 19952617,467249637,9827027521,347403836941]