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A019219 as a simple table

n a(n)
3 0
4 2
5 0
6 4
7 0
8 18
9 18
10 100
11 188
12 568
13 1062
14 2922
15 6026
16 16486
17 38740
18 105022
19 257446
20 683816
21 1707404
22 4469032
23 11326342
24 29594224
25 76051966
26 199150692
27 516590984
28 1355423942
29 3538533686
30 9304610822
31 24412881090

[0,2,0,4,0,18,18,100,188,568,1062,2922,6026,16486,
 38740,105022,257446,683816,1707404,4469032,
 11326342,29594224,76051966,199150692,516590984,
 1355423942,3538533686,9304610822,24412881090]

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Last modified December 4 02:16 EST 2022. Contains 358544 sequences. (Running on oeis4.)