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A074603 as a simple table

n a(n)
0 2
1 10
2 68
3 520
4 4112
5 32800
6 262208
7 2097280
8 16777472
9 134218240
10 1073742848
11 8589936640
12 68719480832
13 549755822080
14 4398046527488
15 35184372121600
16 281474976776192
17 2251799813816320
18 18014398509744128
19 144115188076380160

[2,10,68,520,4112,32800,262208,2097280,16777472,
 134218240,1073742848,8589936640,68719480832,
 549755822080,4398046527488,35184372121600,
 281474976776192,2251799813816320,
 18014398509744128,144115188076380160]

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Last modified October 20 14:40 EDT 2019. Contains 328267 sequences. (Running on oeis4.)