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A216957 as a simple table

n a(n)
1 2
2 2
3 4
4 6
5 12
6 20
7 40
8 74
9 148
10 286
11 568
12 1118
13 2228
14 4412
15 8788
16 17480
17 34836
18 69392
19 138388
20 275942
21 550560
22 1098516
23 2192572
24 4376666
25 8738324
26 17448308
27 34845304
28 69594398
29 139011816
30 277691852
31 554767744
32 1108378658
33 2214594580
34 4425117884
35 8842583584
36 17670722600
37 35314182976
38 70576759892
39 141055781836

[2,2,4,6,12,20,40,74,148,286,568,1118,2228,4412,
 8788,17480,34836,69392,138388,275942,550560,
 1098516,2192572,4376666,8738324,17448308,34845304,
 69594398,139011816,277691852,554767744,1108378658,
 2214594580,4425117884,8842583584,17670722600,
 35314182976,70576759892,141055781836]

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Last modified September 24 12:20 EDT 2020. Contains 337318 sequences. (Running on oeis4.)