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A019178 as a simple table

n a(n)
3 0
4 1
5 5
6 0
7 0
8 26
9 18
10 50
11 264
12 510
13 1222
14 3584
15 8220
16 19844
17 52190
18 130734
19 332766
20 870390
21 2262498
22 5894020
23 15453056
24 40601118
25 106899600
26 282117654
27 746795754
28 1981625744
29 5267084574
30 14033598060
31 37471928032

[0,1,5,0,0,26,18,50,264,510,1222,3584,8220,19844,
 52190,130734,332766,870390,2262498,5894020,
 15453056,40601118,106899600,282117654,746795754,
 1981625744,5267084574,14033598060,37471928032]

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Last modified January 22 23:50 EST 2022. Contains 350504 sequences. (Running on oeis4.)