A139822 - OEIS

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A139822 as a simple table

n	a(n)
0	2
1	66
2	33330
3	342999030
4	2338224387510
5	9355235774427510
6	936123257411127577818510
7	9601480183016524970884020224910
8	394815332706046542049668428841497001870
9	24675958688943241584150818852261991458372001870

[2,66,33330,342999030,2338224387510, 9355235774427510,936123257411127577818510, 9601480183016524970884020224910, 394815332706046542049668428841497001870, 24675958688943241584150818852261991458372001870]