A116364 - OEIS

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A116364 as a simple table

n	a(n)
0	1
1	2
2	9
3	60
4	490
5	4534
6	45689
7	489920
8	5508000
9	64276492
10	773029466
11	9531003552
12	119990158054
13	1537695160070
14	20009930706137
15	263883333450760
16	3521003563829212
17	47470845904561648
18	645960472314074400

[1,2,9,60,490,4534,45689,489920,5508000,64276492, 773029466,9531003552,119990158054,1537695160070, 20009930706137,263883333450760,3521003563829212, 47470845904561648,645960472314074400]