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A057406 as a simple table

n a(n)
8 1
9 12
10 88
11 524
12 2786
13 13788
14 64998
15 296032
16 1314648
17 5728172
18 24595512
19 104399172
20 439084884
21 1833027048
22 7605691356
23 31398503248
24 129072844079
25 528688519536
26 2158900271080
27 8792641674684
28 35728408159781

[1,12,88,524,2786,13788,64998,296032,1314648,
 5728172,24595512,104399172,439084884,1833027048,
 7605691356,31398503248,129072844079,528688519536,
 2158900271080,8792641674684,35728408159781]

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Last modified May 10 21:08 EDT 2021. Contains 343780 sequences. (Running on oeis4.)