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A000163 as a simple table

n a(n)
2 2
3 8
4 34
5 136
6 538
7 2080
8 7970
9 30224
10 113874
11 426520
12 1590338
13 5906640
14 21866794
15 80725280
16 297292610
17 1092539736
18 4007553922
19 14675748416
20 53663197698
21 195962433328
22 714734393378
23 2603994002280
24 9477643739746
25 34463730424720

[2,8,34,136,538,2080,7970,30224,113874,426520,
 1590338,5906640,21866794,80725280,297292610,
 1092539736,4007553922,14675748416,53663197698,
 195962433328,714734393378,2603994002280,
 9477643739746,34463730424720]

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Last modified December 13 22:55 EST 2019. Contains 329974 sequences. (Running on oeis4.)