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A189005 as a simple table

n a(n)
0 1
1 1
2 55
3 209
4 6336
5 30305
6 817991
7 4140081
8 108435745
9 557568000
10 14479521761
11 74795194705
12 1937528668711
13 10021992194369
14 259423766712000
15 1342421467113969
16 34741645659770711
17 179796299139278305
18 4652799879944138561

[1,1,55,209,6336,30305,817991,4140081,108435745,
 557568000,14479521761,74795194705,1937528668711,
 10021992194369,259423766712000,1342421467113969,
 34741645659770711,179796299139278305,
 4652799879944138561]

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Last modified April 4 21:43 EDT 2020. Contains 333238 sequences. (Running on oeis4.)