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A338688 as a simple table

na(n)
11
21
34
4-5
56
62
78
8-121
9172
1044
1112
12-759
1314
14566
155536
16-7665
1718
18-6877
1920
202744
2170862
2221218
2324
24-570573
25218776
26104324
27918568
28942479
2930
30-3693495
3132
32-9408481
3311779582
342223344
3519935756
36-15628120
3738
389954650
39145283360
40-371959011
4142
42-382916059

[1,1,4,-5,6,2,8,-121,172,44,12,-759,14,566,5536,
 -7665,18,-6877,20,2744,70862,21218,24,-570573,
 218776,104324,918568,942479,30,-3693495,32,
 -9408481,11779582,2223344,19935756,-15628120,38,
 9954650,145283360,-371959011,42,-382916059]