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A121868 as a simple table

n a(n)
0 0
1 -1
2 -1
3 0
4 5
5 23
6 74
7 161
8 -57
9 -3466
10 -27361
11 -155397
12 -687688
13 -1888525
14 4974059
15 134695952
16 1400820897
17 11055147275
18 70658948426
19 327448854237
20 223871274083
21 -19116044475298
22 -314203665206509
23 -3562429698724513
24 -33024521386113840
25 -250403183401213513

[0,-1,-1,0,5,23,74,161,-57,-3466,-27361,-155397,
 -687688,-1888525,4974059,134695952,1400820897,
 11055147275,70658948426,327448854237,223871274083,
 -19116044475298,-314203665206509,
 -3562429698724513,-33024521386113840,
 -250403183401213513]

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Last modified August 2 09:22 EDT 2021. Contains 346422 sequences. (Running on oeis4.)