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A083987 as a simple table

na(n)
11
25
334
4255
52040
617000
7145715
81275007
911333396
10102000564
11927277855
1285000470043
13784619723474
147285754575116
1568000376034416
16637503525322650
1760000331795072942
18566669800286800008
195368450739559157971
20510002820258120007246

[1,5,34,255,2040,17000,145715,1275007,11333396,
 102000564,927277855,85000470043,784619723474,
 7285754575116,68000376034416,637503525322650,
 60000331795072942,566669800286800008,
 5368450739559157971,510002820258120007246]