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A118436 as a simple table

na(n)
01
11
2-3
3-11
425
541
6-43
729
8-335
9-1199
103117
116469
12-10295
13-8839
14-16123
15-108691
16354145
17873121
18-1721763
19-2521451
201476985
21-6699319
2234182197
23103232189
24-242017775
25-451910159
26597551757
27130656229
282465133865
2910513816601
30-29729597083
31-66349305331

[1,1,-3,-11,25,41,-43,29,-335,-1199,3117,6469,
 -10295,-8839,-16123,-108691,354145,873121,
 -1721763,-2521451,1476985,-6699319,34182197,
 103232189,-242017775,-451910159,597551757,
 130656229,2465133865,10513816601,-29729597083,
 -66349305331]