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A023431 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 7
6 13
7 26
8 52
9 104
10 212
11 438
12 910
13 1903
14 4009
15 8494
16 18080
17 38656
18 82988
19 178802
20 386490
21 837928
22 1821664
23 3970282
24 8673258
25 18987930
26 41652382
27 91539466
28 201525238
29 444379907
30 981384125
31 2170416738
32 4806513660

[1,1,1,2,4,7,13,26,52,104,212,438,910,1903,4009,
 8494,18080,38656,82988,178802,386490,837928,
 1821664,3970282,8673258,18987930,41652382,
 91539466,201525238,444379907,981384125,2170416738,
 4806513660]

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Last modified November 12 09:23 EST 2019. Contains 329052 sequences. (Running on oeis4.)