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A013222 as a simple table

n a(n)
0 0
1 0
2 -1
3 1
4 -6
5 15
6 -105
7 390
8 -3500
9 15785
10 -181125
11 807750
12 -12261150
13 25793625
14 -784508725
15 -9327500000
16 54587949000
17 -5375441316375
18 69535091676375
19 -2529291250424250
20 40837337931958750
21 -1268829193109066875

[0,0,-1,1,-6,15,-105,390,-3500,15785,-181125,
 807750,-12261150,25793625,-784508725,-9327500000,
 54587949000,-5375441316375,69535091676375,
 -2529291250424250,40837337931958750,
 -1268829193109066875]

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Last modified April 13 13:36 EDT 2024. Contains 371641 sequences. (Running on oeis4.)