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A019243 as a simple table

n a(n)
3 0
4 0
5 2
6 8
7 6
8 16
9 58
10 120
11 254
12 668
13 1616
14 3750
15 9540
16 23832
17 59628
18 151807
19 392948
20 1014372
21 2648282
22 6968089
23 18372218
24 48650007
25 129494286
26 345288143
27 922430248
28 2471294134
29 6633522886
30 17828876698
31 47998957546

[0,0,2,8,6,16,58,120,254,668,1616,3750,9540,23832,
 59628,151807,392948,1014372,2648282,6968089,
 18372218,48650007,129494286,345288143,922430248,
 2471294134,6633522886,17828876698,47998957546]

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Last modified June 25 14:30 EDT 2019. Contains 324352 sequences. (Running on oeis4.)