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A227883 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 5
5 50
6 328
7 2154
8 16751
9 144840
10 1314149
11 12735722
12 134159743
13 1519210786
14 18272249418
15 233231701166
16 3159471128588
17 45243728569842
18 682183513506619
19 10807962134238068
20 179606706777512992
21 3123700853586733882
22 56737351453843424893

[0,0,0,0,5,50,328,2154,16751,144840,1314149,
 12735722,134159743,1519210786,18272249418,
 233231701166,3159471128588,45243728569842,
 682183513506619,10807962134238068,
 179606706777512992,3123700853586733882,
 56737351453843424893]

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Last modified September 22 22:24 EDT 2020. Contains 337291 sequences. (Running on oeis4.)