A012099 - OEIS

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A012099 as a simple table

n	a(n)
0	1
1	1
2	1
3	3
4	9
5	41
6	201
7	1403
8	9649
9	90641
10	809201
11	9578803
12	105268089
13	1504717241
14	19650225401
15	329275068203
16	4982657935329
17	95780865239841
18	1648151554792801
19	35749976635509603
20	689411371817131369

[1,1,1,3,9,41,201,1403,9649,90641,809201,9578803, 105268089,1504717241,19650225401,329275068203, 4982657935329,95780865239841,1648151554792801, 35749976635509603,689411371817131369]