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A222857 as a simple table

n a(n)
1 6
2 18
3 108
4 410
5 2460
6 11160
7 70818
8 346610
9 2213136
10 11587248
11 73844100
12 399763695
13 2535415632
14 14043080412
15 88488807432
16 497957337496
17 3117629380302
18 17742484266750
19 110507820665700
20 634061126810250
21 3931544430607680

[6,18,108,410,2460,11160,70818,346610,2213136,
 11587248,73844100,399763695,2535415632,
 14043080412,88488807432,497957337496,
 3117629380302,17742484266750,110507820665700,
 634061126810250,3931544430607680]

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Last modified August 13 21:23 EDT 2024. Contains 375144 sequences. (Running on oeis4.)