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A090309 as a simple table

n a(n)
0 2
1 20
2 402
3 8060
4 161602
5 3240100
6 64963602
7 1302512140
8 26115206402
9 523606640180
10 10498248010002
11 210488566840220
12 4220269584814402
13 84615880263128260
14 1696537874847379602
15 34015373377210720300

[2,20,402,8060,161602,3240100,64963602,1302512140,
 26115206402,523606640180,10498248010002,
 210488566840220,4220269584814402,
 84615880263128260,1696537874847379602,
 34015373377210720300]

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Last modified April 23 16:40 EDT 2024. Contains 371916 sequences. (Running on oeis4.)