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A305559 as a simple table

n a(n)
0 0
1 -1
2 -1
3 0
4 1
5 4
6 9
7 16
8 25
9 36
10 49
11 64
12 81
13 100
14 121
15 144
16 169
17 196
18 225
19 256
20 289
21 324
22 361
23 400
24 441
25 484
26 529
27 576
28 625
29 676
30 729
31 784
32 841
33 900
34 961
35 1024
36 1089
37 1156
38 1225
39 1296
40 1369
41 1444
42 1521
43 1600
44 1681
45 1764
46 1849
47 1936
48 2025
49 2116
50 2209
51 2304
52 2401
53 2500

[0,-1,-1,0,1,4,9,16,25,36,49,64,81,100,121,144,
 169,196,225,256,289,324,361,400,441,484,529,576,
 625,676,729,784,841,900,961,1024,1089,1156,1225,
 1296,1369,1444,1521,1600,1681,1764,1849,1936,2025,
 2116,2209,2304,2401,2500]

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Last modified September 18 20:13 EDT 2019. Contains 327181 sequences. (Running on oeis4.)