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A019187 as a simple table

n a(n)
3 0
4 0
5 2
6 8
7 6
8 16
9 58
10 120
11 252
12 670
13 1618
14 3754
15 9522
16 23886
17 59622
18 151875
19 392938
20 1014709
21 2648440
22 6966849
23 18374138
24 48654893
25 129490838
26 345287097
27 922517576
28 2471493256
29 6633768512
30 17829837307
31 48003235776

[0,0,2,8,6,16,58,120,252,670,1618,3754,9522,23886,
 59622,151875,392938,1014709,2648440,6966849,
 18374138,48654893,129490838,345287097,922517576,
 2471493256,6633768512,17829837307,48003235776]

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Last modified July 17 18:47 EDT 2019. Contains 325109 sequences. (Running on oeis4.)