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A110428 as a simple table

na(n)
11
22
32
44
54
616
732
864
964
104096
11131072
122097152
138388608
1433554432
1567108864
16134217728
17134217728
1818014398509481984
191208925819614629174706176
2040564819207303340847894502572032
21340282366920938463463374607431768211456

[1,2,2,4,4,16,32,64,64,4096,131072,2097152,
 8388608,33554432,67108864,134217728,134217728,
 18014398509481984,1208925819614629174706176,
 40564819207303340847894502572032,
 340282366920938463463374607431768211456]