A008933 - OEIS

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A008933 as a simple table

n	a(n)
0	1
1	1
2	2
3	6
4	25
5	135
6	913
7	7499
8	73191
9	833597
10	10917343
11	162402263
12	2715430931
13	50576761471
14	1041203832858
15	23529845888598

[1,1,2,6,25,135,913,7499,73191,833597,10917343, 162402263,2715430931,50576761471,1041203832858, 23529845888598]