A137610 - OEIS

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A137610 as a simple table

n	a(n)
0	1
1	2
2	13
3	180
4	3844
5	110908
6	4030740
7	176640072
8	9059743648
9	532179428700
10	35219852623888
11	2592514449263656
12	210072673380786552
13	18579938909696752728
14	1780987027765227959096
15	183907984490301947455872

[1,2,13,180,3844,110908,4030740,176640072, 9059743648,532179428700,35219852623888, 2592514449263656,210072673380786552, 18579938909696752728,1780987027765227959096, 183907984490301947455872]