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A222970 as a simple table

n a(n)
1 1
2 2
3 6
4 12
5 28
6 54
7 119
8 230
9 488
10 948
11 1979
12 3860
13 7978
14 15624
15 32072
16 63014
17 128746
18 253588
19 516346
20 1019072
21 2069590
22 4091174
23 8291746
24 16412668
25 33210428
26 65808044
27 132985161
28 263755984
29 532421062
30 1056789662
31 2131312530
32 4233176854

[1,2,6,12,28,54,119,230,488,948,1979,3860,7978,
 15624,32072,63014,128746,253588,516346,1019072,
 2069590,4091174,8291746,16412668,33210428,
 65808044,132985161,263755984,532421062,1056789662,
 2131312530,4233176854]

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Last modified December 7 12:12 EST 2022. Contains 358656 sequences. (Running on oeis4.)