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A201921 as a simple table

na(n)
10
21
36
410
5100
6126
71000
82376
94375
1046251
11156250
12603126
133640626
147750000
1519140625
16151718751
17835156251
181727734375
195960937501
2032482421875
21236621093751
22340029296875
238413134765625
2460784912109376
2568961425781250
26709516601562501
271236678466796875

[0,1,6,10,100,126,1000,2376,4375,46251,156250,
 603126,3640626,7750000,19140625,151718751,
 835156251,1727734375,5960937501,32482421875,
 236621093751,340029296875,8413134765625,
 60784912109376,68961425781250,709516601562501,
 1236678466796875]