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A189260 as a simple table

n a(n)
1 20
2 400
3 4720
4 52748
5 552752
6 5746968
7 59399960
8 613358776
9 6329670680
10 65317473848
11 674005375088
12 6955021798680
13 71768481603464
14 740576822228336
15 7641997047772264
16 78857656505309336
17 813731203352806672

[20,400,4720,52748,552752,5746968,59399960,
 613358776,6329670680,65317473848,674005375088,
 6955021798680,71768481603464,740576822228336,
 7641997047772264,78857656505309336,
 813731203352806672]

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Last modified November 21 11:01 EST 2018. Contains 317447 sequences. (Running on oeis4.)