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A019182 as a simple table

n a(n)
3 0
4 1
5 4
6 2
7 6
8 28
9 30
10 86
11 254
12 476
13 1312
14 3490
15 7888
16 20646
17 53798
18 132278
19 341967
20 891362
21 2293634
22 5997354
23 15730336
24 41162492
25 108408958
26 286102265
27 755556788
28 2002895401
29 5321868173
30 14163666153
31 37790655166

[0,1,4,2,6,28,30,86,254,476,1312,3490,7888,20646,
 53798,132278,341967,891362,2293634,5997354,
 15730336,41162492,108408958,286102265,755556788,
 2002895401,5321868173,14163666153,37790655166]

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Last modified July 3 10:25 EDT 2022. Contains 355050 sequences. (Running on oeis4.)