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A220227 as a simple table

n a(n)
1 1
2 6
3 18
4 51
5 157
6 477
7 1445
8 4384
9 13297
10 40332
11 122339
12 371085
13 1125588
14 3414184
15 10356065
16 31412486
17 95281776
18 289013030
19 876647491
20 2659087097
21 8065664119
22 24465139829
23 74208776604
24 225093441705
25 682763681270
26 2070989900565

[1,6,18,51,157,477,1445,4384,13297,40332,122339,
 371085,1125588,3414184,10356065,31412486,95281776,
 289013030,876647491,2659087097,8065664119,
 24465139829,74208776604,225093441705,682763681270,
 2070989900565]

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Last modified January 20 00:08 EST 2022. Contains 350467 sequences. (Running on oeis4.)