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A137346 as a simple table

na(n)
01
1-2
21
34
4-5
51
6-8
720
8-9
91
1016
11-78
1259
13-14
141
15-32
16324
17-360
18135
19-20
201
2164
22-1520
232254
24-1165
25265
26-27
271
28-128
298336
30-15232
319954
32-3045
33469
34-35
351
36256
37-53872
38113868
39-88508
4033649
41-6888
42770
43-44
441
45-512
46405600
47-948840
48839684
49-376278
5095025
51-14028
521194
53-54

[1,-2,1,4,-5,1,-8,20,-9,1,16,-78,59,-14,1,-32,324,
 -360,135,-20,1,64,-1520,2254,-1165,265,-27,1,-128,
 8336,-15232,9954,-3045,469,-35,1,256,-53872,
 113868,-88508,33649,-6888,770,-44,1,-512,405600,
 -948840,839684,-376278,95025,-14028,1194,-54]