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A088992 as a simple table

na(n)
01
10
25
350
4825
517500
6458125
714268750
8515440625
921188375000
10976671703125
1149893003906250
122797832158515625
13170863509745312500
1411287987223748828125
15802119551344589843750
1661005565392625400390625
174944614795517599218750000

[1,0,5,50,825,17500,458125,14268750,515440625,
 21188375000,976671703125,49893003906250,
 2797832158515625,170863509745312500,
 11287987223748828125,802119551344589843750,
 61005565392625400390625,4944614795517599218750000]