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A068772 as a simple table

n a(n)
0 1
1 1
2 20
3 410
4 8600
5 184200
6 4020000
7 89205000
8 2008700000
9 45816140000
10 1056825200000
11 24618524200000
12 578457724000000
13 13695679012000000
14 326448619920000000
15 7827776361090000000
16 188701194087000000000

[1,1,20,410,8600,184200,4020000,89205000,
 2008700000,45816140000,1056825200000,
 24618524200000,578457724000000,13695679012000000,
 326448619920000000,7827776361090000000,
 188701194087000000000]

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Last modified October 21 04:12 EDT 2018. Contains 316405 sequences. (Running on oeis4.)