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A016938 as a simple table

na(n)
064
1262144
27529536
364000000
4308915776
51073741824
63010936384
77256313856
815625000000
930840979456
1056800235584
1198867482624
12164206490176
13262144000000
14404567235136
15606355001344
16885842380864
171265319018496
181771561000000
192436396322816
203297303959104

[64,262144,7529536,64000000,308915776,1073741824,
 3010936384,7256313856,15625000000,30840979456,
 56800235584,98867482624,164206490176,262144000000,
 404567235136,606355001344,885842380864,
 1265319018496,1771561000000,2436396322816,
 3297303959104]