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A106181 as a simple table

na(n)
00
11
2-1
3-1
42
52
6-5
7-5
814
914
10-42
11-42
12132
13132
14-429
15-429
161430
171430
18-4862
19-4862
2016796
2116796
22-58786
23-58786
24208012
25208012
26-742900
27-742900
282674440
292674440
30-9694845
31-9694845
3235357670
3335357670
34-129644790
35-129644790
36477638700
37477638700
38-1767263190
39-1767263190

[0,1,-1,-1,2,2,-5,-5,14,14,-42,-42,132,132,-429,
 -429,1430,1430,-4862,-4862,16796,16796,-58786,
 -58786,208012,208012,-742900,-742900,2674440,
 2674440,-9694845,-9694845,35357670,35357670,
 -129644790,-129644790,477638700,477638700,
 -1767263190,-1767263190]