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A270609 as a simple table

n a(n)
1 0
2 0
3 8808
4 171576
5 1728288
6 13177740
7 70129212
8 309511644
9 1134068490
10 3559466436
11 10133969880
12 25490692140
13 60750723804
14 131276815188
15 274807319832
16 531982013820
17 1009843336080
18 1799168710884
19 3165521551848

[0,0,8808,171576,1728288,13177740,70129212,
 309511644,1134068490,3559466436,10133969880,
 25490692140,60750723804,131276815188,274807319832,
 531982013820,1009843336080,1799168710884,
 3165521551848]

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)