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A019215 as a simple table

n a(n)
3 0
4 2
5 0
6 4
7 0
8 40
9 0
10 150
11 4
12 610
13 96
14 2798
15 864
16 13218
17 7192
18 64934
19 52332
20 328222
21 339808
22 1727350
23 2177700
24 9454774
25 13785720
26 53012810
27 85897980
28 303909174
29 534416936
30 1779749852
31 3336552436
32 10595394664
33 20885768548
34 63879012118

[0,2,0,4,0,40,0,150,4,610,96,2798,864,13218,7192,
 64934,52332,328222,339808,1727350,2177700,9454774,
 13785720,53012810,85897980,303909174,534416936,
 1779749852,3336552436,10595394664,20885768548,
 63879012118]

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Last modified August 8 12:30 EDT 2022. Contains 356009 sequences. (Running on oeis4.)