A146037 - OEIS

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A146037 as a simple table

n	a(n)
1	1
2	1
3	1
4	3
5	7
6	19
7	89
8	399
9	1939
10	11793
11	102715
12	985113
13	13989079
14	211198639
15	4331591655
16	98297746517
17	2965968725989
18	100683520176799

[1,1,1,3,7,19,89,399,1939,11793,102715,985113, 13989079,211198639,4331591655,98297746517, 2965968725989,100683520176799]