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A082639 as a simple table

n a(n)
1 0
2 2
3 16
4 98
5 576
6 3362
7 19600
8 114242
9 665856
10 3880898
11 22619536
12 131836322
13 768398400
14 4478554082
15 26102926096
16 152139002498
17 886731088896
18 5168247530882
19 30122754096400
20 175568277047522
21 1023286908188736

[0,2,16,98,576,3362,19600,114242,665856,3880898,
 22619536,131836322,768398400,4478554082,
 26102926096,152139002498,886731088896,
 5168247530882,30122754096400,175568277047522,
 1023286908188736]

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Last modified January 20 23:24 EST 2020. Contains 331104 sequences. (Running on oeis4.)