A121396 - OEIS

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A121396 as a simple table

n	a(n)
0	1
1	1
2	2
3	5
4	16
5	75
6	594
7	8420
8	212790
9	9542280
10	763184598
11	109735708579
12	28582820337914
13	13580038203578493
14	11845224434439055236
15	19084161956327789507755
16	57113015617717986294647190

[1,1,2,5,16,75,594,8420,212790,9542280,763184598, 109735708579,28582820337914,13580038203578493, 11845224434439055236,19084161956327789507755, 57113015617717986294647190]