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A019139 as a simple table

n a(n)
3 0
4 2
5 0
6 4
7 0
8 18
9 18
10 100
11 190
12 566
13 1044
14 2906
15 6052
16 16554
17 38714
18 105048
19 256738
20 681482
21 1701000
22 4456682
23 11294306
24 29512554
25 75812418
26 198490158
27 514680240
28 1350074996
29 3523718014
30 9264323404
31 24301933916

[0,2,0,4,0,18,18,100,190,566,1044,2906,6052,16554,
 38714,105048,256738,681482,1701000,4456682,
 11294306,29512554,75812418,198490158,514680240,
 1350074996,3523718014,9264323404,24301933916]

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Last modified October 6 00:49 EDT 2022. Contains 357261 sequences. (Running on oeis4.)