A118181 - OEIS

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A118181 as a simple table

n	a(n)
0	1
1	2
2	5
3	20
4	137
5	1622
6	33293
7	1182440
8	72811793
9	7757988842
10	1433154521621
11	458101483131260
12	253879024041595289
13	243453910296759945662
14	404765167247068325944349
15	1164432505878183620543030480

[1,2,5,20,137,1622,33293,1182440,72811793, 7757988842,1433154521621,458101483131260, 253879024041595289,243453910296759945662, 404765167247068325944349, 1164432505878183620543030480]