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A219119 as a simple table

n a(n)
0 1
1 1
2 2
3 12
4 96
5 1000
6 13500
7 221718
8 4301808
9 97747200
10 2555001360
11 75526842600
12 2503943418240
13 92407030642056
14 3759862792921872
15 167429488088545200
16 8120958429706093440
17 426777425467443381120
18 24161214872571127574400
19 1467122583066982481802816

[1,1,2,12,96,1000,13500,221718,4301808,97747200,
 2555001360,75526842600,2503943418240,
 92407030642056,3759862792921872,
 167429488088545200,8120958429706093440,
 426777425467443381120,24161214872571127574400,
 1467122583066982481802816]

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Last modified June 18 03:16 EDT 2021. Contains 345098 sequences. (Running on oeis4.)