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A091764 as a simple table

n a(n)
0 1
1 2
2 2
3 6
4 12
5 -2
6 20
7 60
8 -20
9 4
10 70
11 280
12 -140
13 56
14 -10
15 252
16 1260
17 -840
18 504
19 -180
20 28
21 924
22 5544
23 -4620
24 3696
25 -1980
26 616
27 -84
28 3432
29 24024
30 -24024
31 24024
32 -17160
33 8008
34 -2184
35 264
36 12870
37 102960
38 -120120
39 144144
40 -128700
41 80080
42 -32760
43 7920

[1,2,2,6,12,-2,20,60,-20,4,70,280,-140,56,-10,252,
 1260,-840,504,-180,28,924,5544,-4620,3696,-1980,
 616,-84,3432,24024,-24024,24024,-17160,8008,-2184,
 264,12870,102960,-120120,144144,-128700,80080,
 -32760,7920]

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Last modified August 7 15:20 EDT 2020. Contains 336276 sequences. (Running on oeis4.)