A191507 - OEIS

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A191507 as a simple table

n	a(n)
1	2
2	8
3	52
4	646
5	14570
6	599702
7	45191945
8	6225542127
9	1567856872728
10	722008623925586
11	607932060252871024
12	935917819388424802645
13	2634499346573878930718088
14	13559220442178025486399949918

[2,8,52,646,14570,599702,45191945,6225542127, 1567856872728,722008623925586,607932060252871024, 935917819388424802645,2634499346573878930718088, 13559220442178025486399949918]