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A274485 as a simple table

na(n)
12
250
33925
450881
5625000000
6117650
71562500000000
8815737282
93906250000000000
1025937425625
119765625000000000000
1223298085126577
1324414062500000000000000
147862651120078217664621465531250
1561035156250000000000000000
1610000000000000001
17152587890625000000000000000000

[2,50,3925,50881,625000000,117650,1562500000000,
 815737282,3906250000000000,25937425625,
 9765625000000000000,23298085126577,
 24414062500000000000000,
 7862651120078217664621465531250,
 61035156250000000000000000,10000000000000001,
 152587890625000000000000000000]