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A110331 as a simple table

na(n)
01
1-1
2-5
3-11
4-19
5-29
6-41
7-55
8-71
9-89
10-109
11-131
12-155
13-181
14-209
15-239
16-271
17-305
18-341
19-379
20-419
21-461
22-505
23-551
24-599
25-649
26-701
27-755
28-811
29-869
30-929
31-991
32-1055
33-1121
34-1189
35-1259
36-1331
37-1405
38-1481
39-1559
40-1639
41-1721
42-1805
43-1891
44-1979
45-2069
46-2161
47-2255
48-2351
49-2449

[1,-1,-5,-11,-19,-29,-41,-55,-71,-89,-109,-131,
 -155,-181,-209,-239,-271,-305,-341,-379,-419,-461,
 -505,-551,-599,-649,-701,-755,-811,-869,-929,-991,
 -1055,-1121,-1189,-1259,-1331,-1405,-1481,-1559,
 -1639,-1721,-1805,-1891,-1979,-2069,-2161,-2255,
 -2351,-2449]