A268018 - OEIS

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A268018 as a simple table

n	a(n)
1	622
2	386884
3	240641848
4	119453097281
5	54331933243657
6	22512810387947289
7	8694139636843767211
8	3161840103618790632192

[622,386884,240641848,119453097281,54331933243657, 22512810387947289,8694139636843767211, 3161840103618790632192]