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A281983 as a simple table

n a(n)
1 0
2 2
3 121
4 1054
5 7053
6 41118
7 226025
8 1189600
9 6090935
10 30538028
11 150719259
12 734621288
13 3544728240
14 16962264274
15 80602719361
16 380741691862
17 1789303173765
18 8371399843188
19 39012925707604
20 181180019619130
21 838816233474674

[0,2,121,1054,7053,41118,226025,1189600,6090935,
 30538028,150719259,734621288,3544728240,
 16962264274,80602719361,380741691862,
 1789303173765,8371399843188,39012925707604,
 181180019619130,838816233474674]

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Last modified April 24 06:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)