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A064880 as a simple table

n a(n)
0 1
1 2
2 2
3 4
4 11
5 50
6 389
7 4590
8 73950
9 1559648
10 41768100
11 1372257648
12 53854228438
13 2482184155472
14 132554850677690
15 8096323604940164
16 559278345518698923
17 43305732768029924394
18 3731115433469990603265

[1,2,2,4,11,50,389,4590,73950,1559648,41768100,
 1372257648,53854228438,2482184155472,
 132554850677690,8096323604940164,
 559278345518698923,43305732768029924394,
 3731115433469990603265]

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Last modified April 21 07:37 EDT 2024. Contains 371850 sequences. (Running on oeis4.)