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A005654 as a simple table

n a(n)
1 1
2 2
3 6
4 19
5 66
6 236
7 868
8 3235
9 12190
10 46252
11 176484
12 676270
13 2600612
14 10030008
15 38781096
16 150273315
17 583407990
18 2268795980
19 8836340260
20 34461678394
21 134564560988
22 526024917288
23 2058358034616
24 8061901596814
25 31602652961516
26 123979635837176
27 486734861612328

[1,2,6,19,66,236,868,3235,12190,46252,176484,
 676270,2600612,10030008,38781096,150273315,
 583407990,2268795980,8836340260,34461678394,
 134564560988,526024917288,2058358034616,
 8061901596814,31602652961516,123979635837176,
 486734861612328]

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Last modified February 21 10:51 EST 2018. Contains 299390 sequences. (Running on oeis4.)