A250865 - OEIS

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A250865 as a simple table

n	a(n)
1	8000000000
2	1750000000000
3	382812500000000
4	83740234375000000
5	5744580078125000000
6	394078193359375000000
7	27033764064453125000000
8	890167783114312500000000
9	29311444762388082000000000

[8000000000,1750000000000,382812500000000, 83740234375000000,5744580078125000000, 394078193359375000000,27033764064453125000000, 890167783114312500000000, 29311444762388082000000000]