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A228935 as a simple table

n a(n)
0 0
1 3
2 -9
3 15
4 -21
5 27
6 -33
7 39
8 -45
9 51
10 -57
11 63
12 -69
13 75
14 -81
15 87
16 -93
17 99
18 -105
19 111
20 -117
21 123
22 -129
23 135
24 -141
25 147
26 -153
27 159
28 -165
29 171
30 -177
31 183
32 -189
33 195
34 -201
35 207
36 -213
37 219
38 -225
39 231
40 -237
41 243
42 -249
43 255
44 -261
45 267
46 -273
47 279
48 -285
49 291

[0,3,-9,15,-21,27,-33,39,-45,51,-57,63,-69,75,-81,
 87,-93,99,-105,111,-117,123,-129,135,-141,147,
 -153,159,-165,171,-177,183,-189,195,-201,207,-213,
 219,-225,231,-237,243,-249,255,-261,267,-273,279,
 -285,291]

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Last modified February 22 09:43 EST 2019. Contains 320390 sequences. (Running on oeis4.)