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A026578 as a simple table

n a(n)
2 1
3 3
4 13
5 60
6 225
7 1148
8 4235
9 22296
10 82425
11 440308
12 1634435
13 8809736
14 32819839
15 178029138
16 665162897
17 3625521728
18 13577768505

[1,3,13,60,225,1148,4235,22296,82425,440308,
 1634435,8809736,32819839,178029138,665162897,
 3625521728,13577768505]

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Last modified April 8 03:01 EDT 2020. Contains 333312 sequences. (Running on oeis4.)