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A030435 as a simple table

n a(n)
0 2
1 2
2 4
3 6
4 12
5 20
6 40
7 68
8 136
9 232
10 464
11 792
12 1584
13 2704
14 5408
15 9232
16 18464
17 31520
18 63040
19 107616
20 215232
21 367424
22 734848
23 1254464
24 2508928
25 4283008
26 8566016
27 14623104
28 29246208
29 49926400
30 99852800

[2,2,4,6,12,20,40,68,136,232,464,792,1584,2704,
 5408,9232,18464,31520,63040,107616,215232,367424,
 734848,1254464,2508928,4283008,8566016,14623104,
 29246208,49926400,99852800]

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Last modified March 26 00:26 EDT 2019. Contains 321479 sequences. (Running on oeis4.)