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A338548 as a simple table

na(n)
11
2-9
326
4-56
5124
6-234
7342
8-448
9702
10-1116
111330
12-1456
132196
14-3078
153224
16-3584
174912
18-6318
196858
20-6944
218892
22-11970
2312166
24-11648
2515500
26-19764
2718954
28-19152
2924388
30-29016
3129790
32-28672
3334580
34-44208
3542408
36-39312
3750652
38-61722
3957096
40-55552
4168920
42-80028

[1,-9,26,-56,124,-234,342,-448,702,-1116,1330,
 -1456,2196,-3078,3224,-3584,4912,-6318,6858,-6944,
 8892,-11970,12166,-11648,15500,-19764,18954,
 -19152,24388,-29016,29790,-28672,34580,-44208,
 42408,-39312,50652,-61722,57096,-55552,68920,
 -80028]