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A000083 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 9
6 23
7 63
8 188
9 596
10 1979
11 6804
12 24118
13 87379
14 322652
15 1209808
16 4596158
17 17657037
18 68497898
19 268006183
20 1056597059
21 4193905901
22 16748682185
23 67258011248
24 271452424286
25 1100632738565
26 4481533246014

[1,1,1,2,4,9,23,63,188,596,1979,6804,24118,87379,
 322652,1209808,4596158,17657037,68497898,
 268006183,1056597059,4193905901,16748682185,
 67258011248,271452424286,1100632738565,
 4481533246014]

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Last modified February 20 11:56 EST 2018. Contains 299387 sequences. (Running on oeis4.)