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A075210 as a simple table

n a(n)
1 0
2 0
3 0
4 1
5 9
6 39
7 197
8 721
9 2717
10 8211
11 19836
12 74497
13 132611
14 403534
15 1127416
16 2364402
17 4173316
18 15604400
19 21318428
20 73965916
21 154211880 

[0,0,0,1,9,39,197,721,2717,8211,19836,74497,
 132611,403534,1127416,2364402,4173316,15604400,
 21318428,73965916,154211880]

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)