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A016940 as a simple table

na(n)
0256
116777216
21475789056
325600000000
4208827064576
51099511627776
64347792138496
714048223625216
839062500000000
996717311574016
10218340105584896
11457163239653376
12899194740203776
131677721600000000
142992179271065856
155132188731375616
168507630225817856

[256,16777216,1475789056,25600000000,208827064576,
 1099511627776,4347792138496,14048223625216,
 39062500000000,96717311574016,218340105584896,
 457163239653376,899194740203776,1677721600000000,
 2992179271065856,5132188731375616,
 8507630225817856]