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A304723 as a simple table

na(n)
00
11
220
3325
45000
575625
61137500
717078125
8256250000
93844140625
1057664062500
11864970703125
1212974609375000
13194619384765625
142919291992187500
1543789385986328125
16656840820312500000
179852612457275390625
18147789187622070312500
192216837818145751953125
2033252567291259765625000

[0,1,20,325,5000,75625,1137500,17078125,256250000,
 3844140625,57664062500,864970703125,
 12974609375000,194619384765625,2919291992187500,
 43789385986328125,656840820312500000,
 9852612457275390625,147789187622070312500,
 2216837818145751953125,33252567291259765625000]