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A009778 as a simple table

n a(n)
0 0
1 1
2 1
3 0
4 4
5 -5
6 -9
7 196
8 -1280
9 4509
10 12565
11 -386144
12 3804516
13 -19339385
14 -75459461
15 3162527460
16 -41545303904
17 276166431961
18 1385435722185
19 -73547738586656
20 1207721984518180
21 -9917136571683789
22 -60806773846655969

[0,1,1,0,4,-5,-9,196,-1280,4509,12565,-386144,
 3804516,-19339385,-75459461,3162527460,
 -41545303904,276166431961,1385435722185,
 -73547738586656,1207721984518180,
 -9917136571683789,-60806773846655969]

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Last modified December 5 03:16 EST 2020. Contains 338943 sequences. (Running on oeis4.)