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A007758 as a simple table

n a(n)
0 0
1 2
2 16
3 72
4 256
5 800
6 2304
7 6272
8 16384
9 41472
10 102400
11 247808
12 589824
13 1384448
14 3211264
15 7372800
16 16777216
17 37879808
18 84934656
19 189267968
20 419430400
21 924844032
22 2030043136
23 4437573632
24 9663676416
25 20971520000
26 45365592064
27 97844723712
28 210453397504

[0,2,16,72,256,800,2304,6272,16384,41472,102400,
 247808,589824,1384448,3211264,7372800,16777216,
 37879808,84934656,189267968,419430400,924844032,
 2030043136,4437573632,9663676416,20971520000,
 45365592064,97844723712,210453397504]

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Last modified June 19 06:47 EDT 2019. Contains 324218 sequences. (Running on oeis4.)