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A016748 as a simple table

n a(n)
0 0
1 256
2 65536
3 1679616
4 16777216
5 100000000
6 429981696
7 1475789056
8 4294967296
9 11019960576
10 25600000000
11 54875873536
12 110075314176
13 208827064576
14 377801998336
15 656100000000
16 1099511627776
17 1785793904896
18 2821109907456
19 4347792138496
20 6553600000000
21 9682651996416

[0,256,65536,1679616,16777216,100000000,429981696,
 1475789056,4294967296,11019960576,25600000000,
 54875873536,110075314176,208827064576,
 377801998336,656100000000,1099511627776,
 1785793904896,2821109907456,4347792138496,
 6553600000000,9682651996416]

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Last modified June 22 19:28 EDT 2021. Contains 345388 sequences. (Running on oeis4.)