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A117735 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 18
5 90
6 690
7 4830
8 40110
9 362670
10 3628590
11 39914490
12 478999290
13 6226990770
14 87178261170
15 1307674337970
16 20922789857970
17 355687427585490
18 6402373705217490
19 121645100399132310
20 2432902008166940310

[0,0,0,0,18,90,690,4830,40110,362670,3628590,
 39914490,478999290,6226990770,87178261170,
 1307674337970,20922789857970,355687427585490,
 6402373705217490,121645100399132310,
 2432902008166940310]

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Last modified January 16 14:56 EST 2021. Contains 340206 sequences. (Running on oeis4.)