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A201507 as a simple table

n a(n)
1 0
2 0
3 0
4 20
5 12798
6 763144
7 15516804
8 170842828
9 1264750240
10 7084450248
11 32251861624
12 125030824732
13 426265242412
14 1308045124808
15 3675893768908
16 9586626461484
17 23445303141400
18 54219244028296
19 119372323892736
20 251614892723068
21 510130577706724
22 998740710435208

[0,0,0,20,12798,763144,15516804,170842828,
 1264750240,7084450248,32251861624,125030824732,
 426265242412,1308045124808,3675893768908,
 9586626461484,23445303141400,54219244028296,
 119372323892736,251614892723068,510130577706724,
 998740710435208]

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Last modified May 20 05:07 EDT 2024. Contains 372703 sequences. (Running on oeis4.)