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A060918 as a simple table

n a(n)
4 1
5 20
6 360
7 6860
8 143570
9 3321864
10 84756000
11 2372001720
12 72384192540
13 2394775746220
14 85443353291296
15 3271908306712500
16 133893717061821080
17 5832748749666611920
18 269542701201588099840
19 13172225935626444660144
20 678788199609330554538000
21 36790272488566573278647940

[1,20,360,6860,143570,3321864,84756000,2372001720,
 72384192540,2394775746220,85443353291296,
 3271908306712500,133893717061821080,
 5832748749666611920,269542701201588099840,
 13172225935626444660144,678788199609330554538000,
 36790272488566573278647940]

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Last modified January 21 07:15 EST 2021. Contains 340335 sequences. (Running on oeis4.)