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A067636 as a simple table

n a(n)
0 2
1 20
2 210
3 2352
4 27720
5 339768
6 4294290
7 55621280
8 734959368
9 9873696560
10 134510127752
11 1854385377600
12 25828939188000
13 362995937665200
14 5141806953167250
15 73343003232628800
16 1052697272275341000
17 15194039267330154000
18 220410039466873456200

[2,20,210,2352,27720,339768,4294290,55621280,
 734959368,9873696560,134510127752,1854385377600,
 25828939188000,362995937665200,5141806953167250,
 73343003232628800,1052697272275341000,
 15194039267330154000,220410039466873456200]

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Last modified July 29 16:52 EDT 2021. Contains 346346 sequences. (Running on oeis4.)