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A199933 as a simple table

n a(n)
0 1
1 1
2 -4
3 0
4 20
5 -25
6 -71
7 216
8 94
9 -1220
10 1037
11 4941
12 -11440
13 -11008
14 72112
15 -33453
16 -326675
17 577060
18 950750
19 -4129272
20 279257
21 20740793
22 -27217100
23 -72078336
24 228625372
25 83808415
26 -1271796511
27 1153458144
28 5060707454
29 -12183603100
30 -10694679515
31 75519944325
32 -39290857304
33 -336819940736

[1,1,-4,0,20,-25,-71,216,94,-1220,1037,4941,
 -11440,-11008,72112,-33453,-326675,577060,950750,
 -4129272,279257,20740793,-27217100,-72078336,
 228625372,83808415,-1271796511,1153458144,
 5060707454,-12183603100,-10694679515,75519944325,
 -39290857304,-336819940736]

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Last modified July 30 18:40 EDT 2021. Contains 346359 sequences. (Running on oeis4.)