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A228197 as a simple table

n a(n)
0 1
1 2
2 8
3 36
4 160
5 692
6 2928
7 12200
8 50304
9 205940
10 838928
11 3405496
12 13788736
13 55723592
14 224863712
15 906365136
16 3649978880
17 14687731572
18 59067989072
19 237424661016
20 953914608320
21 3831159414552
22 15381896102432
23 61739966366256
24 247750559632640
25 993955865320392
26 3986890331450528

[1,2,8,36,160,692,2928,12200,50304,205940,838928,
 3405496,13788736,55723592,224863712,906365136,
 3649978880,14687731572,59067989072,237424661016,
 953914608320,3831159414552,15381896102432,
 61739966366256,247750559632640,993955865320392,
 3986890331450528]

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Last modified December 9 17:18 EST 2019. Contains 329879 sequences. (Running on oeis4.)