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A003481 as a simple table

n a(n)
0 2
1 20
2 143
3 986
4 6764
5 46367
6 317810
7 2178308
8 14930351
9 102334154
10 701408732
11 4807526975
12 32951280098
13 225851433716
14 1548008755919
15 10610209857722
16 72723460248140
17 498454011879263
18 3416454622906706
19 23416728348467684
20 160500643816367087
21 1100087778366101930

[2,20,143,986,6764,46367,317810,2178308,14930351,
 102334154,701408732,4807526975,32951280098,
 225851433716,1548008755919,10610209857722,
 72723460248140,498454011879263,3416454622906706,
 23416728348467684,160500643816367087,
 1100087778366101930]

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Last modified July 8 04:16 EDT 2020. Contains 335504 sequences. (Running on oeis4.)