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A208017 as a simple table

n a(n)
1 20
2 400
3 1260
4 8643
5 32860
6 92560
7 393049
8 1578401
9 5340405
10 20121640
11 78251775
12 284274270
13 1051011118
14 3983096719
15 14785680541
16 54778074707
17 205202336088
18 765281117395
19 2844826058100
20 10615121655468
21 39598654722769

[20,400,1260,8643,32860,92560,393049,1578401,
 5340405,20121640,78251775,284274270,1051011118,
 3983096719,14785680541,54778074707,205202336088,
 765281117395,2844826058100,10615121655468,
 39598654722769]

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Last modified April 25 09:56 EDT 2024. Contains 371967 sequences. (Running on oeis4.)