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A275574 as a simple table

na(n)
10
21
34
48
562
6108
71200
82048
929524
1050000
11885780
121492992
1331374258
1452706752
151281445312
162147483648
1759293938248
1899179645184
193065533128900
205120000000000

[0,1,4,8,62,108,1200,2048,29524,50000,885780,
 1492992,31374258,52706752,1281445312,2147483648,
 59293938248,99179645184,3065533128900,
 5120000000000]