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A117291 as a simple table

na(n)
11
21
32
44
54
616
76
8256
9216
104096
1110
1265536
1312
141679616
152097152
1616777216
1716
182176782336
1918
2068719476736
215159780352
221000000000000
2322
24281474976710656
253200000
261283918464548864
27198359290368
28184884258895036416
2928

[1,1,2,4,4,16,6,256,216,4096,10,65536,12,1679616,
 2097152,16777216,16,2176782336,18,68719476736,
 5159780352,1000000000000,22,281474976710656,
 3200000,1283918464548864,198359290368,
 184884258895036416,28]