A227039 - OEIS

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A227039 as a simple table

n	a(n)
0	1
1	4562499
2	20816392562501
3	94974749433621124999
4	433322104341376699173125001
5	1977031234413227532474550849687499
6	9020201052947448468355731925898341687501
7	41154649263668650710741676972914857601690249999

[1,4562499,20816392562501,94974749433621124999, 433322104341376699173125001, 1977031234413227532474550849687499, 9020201052947448468355731925898341687501, 41154649263668650710741676972914857601690249999]