A091906 - OEIS

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A091906 as a simple table

n	a(n)
0	1
1	1
2	3
3	14
4	94
5	842
6	9519
7	130482
8	2105618
9	39124431
10	822878381
11	19327882796
12	501494558195
13	14245978068064
14	439754047318837
15	14657503897927947
16	524655050276784041
17	20072230656725277199
18	817381577168986757486

[1,1,3,14,94,842,9519,130482,2105618,39124431, 822878381,19327882796,501494558195,14245978068064, 439754047318837,14657503897927947, 524655050276784041,20072230656725277199, 817381577168986757486]