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A081894 as a simple table

na(n)
01
17
246
3290
41775
510625
662500
7362500
82078125
911796875
1066406250
11371093750
122060546875
1311376953125
1462500000000
15341796875000
161861572265625
1710101318359375
1854626464843750
19294494628906250
201583099365234375

[1,7,46,290,1775,10625,62500,362500,2078125,
 11796875,66406250,371093750,2060546875,
 11376953125,62500000000,341796875000,
 1861572265625,10101318359375,54626464843750,
 294494628906250,1583099365234375]