A259867 - OEIS

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A259867 as a simple table

n	a(n)
1	5
2	1500
3	234375
4	300000000
5	7500000000000000000000000000
6	750000000000000000000000000000000000
7	1500000000000000000000000000000000000000000000000000000000000000000

[5,1500,234375,300000000, 7500000000000000000000000000, 750000000000000000000000000000000000, 15000000000000000000000000000000000000000000000000\ 00000000000000000]