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A157578 as a simple table

n a(n)
2 1
3 3
4 150
5 15210
6 1639575
7 123643611
8 7614820759
9 421492526271
10 22902703731540
11 1192049263269315
12 60248523072916695
13 2966823784716819963
14 139916416171825355244
15 6279781745619795030660
16 269526833541639073889370

[1,3,150,15210,1639575,123643611,7614820759,
 421492526271,22902703731540,1192049263269315,
 60248523072916695,2966823784716819963,
 139916416171825355244,6279781745619795030660,
 269526833541639073889370]

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Last modified January 27 18:40 EST 2022. Contains 350611 sequences. (Running on oeis4.)