A037484 - OEIS

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A037484 as a simple table

n	a(n)
1	1
2	9
3	64
4	450
5	3151
6	22059
7	154414
8	1080900
9	7566301
10	52964109
11	370748764
12	2595241350
13	18166689451
14	127166826159
15	890167783114
16	6231174481800
17	43618221372601
18	305327549608209
19	2137292847257464

[1,9,64,450,3151,22059,154414,1080900,7566301, 52964109,370748764,2595241350,18166689451, 127166826159,890167783114,6231174481800, 43618221372601,305327549608209,2137292847257464]