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A086680 as a simple table

n a(n)
0 0
1 2
2 6
3 18
4 54
5 172
6 564
7 1900
8 6542
9 23000
10 82025
11 295947
12 1077871
13 3957809
14 14630843
15 54400028
16 203280221
17 762939111
18 2874398515
19 10866266172
20 41203088796
21 156661034233
22 597116381732
23 2280998753949
24 8731188863470

[0,2,6,18,54,172,564,1900,6542,23000,82025,295947,
 1077871,3957809,14630843,54400028,203280221,
 762939111,2874398515,10866266172,41203088796,
 156661034233,597116381732,2280998753949,
 8731188863470]

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Last modified October 22 18:45 EDT 2021. Contains 348175 sequences. (Running on oeis4.)