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A106632 as a simple table

na(n)
0-1
11
2-25
349
4-1
5529
6-1849
7289
8-9025
958081
10-38809
11108241
12-1560001
132283121
14-525625
1535796289
16-95863681
172666689
18-681575449
193261894769
20-1289169025
219906021841
22-94109673529
2399199171681
24-84332740801
252327696411041
26-4753075824025
2746970592529
28-48635546218561

[-1,1,-25,49,-1,529,-1849,289,-9025,58081,-38809,
 108241,-1560001,2283121,-525625,35796289,
 -95863681,2666689,-681575449,3261894769,
 -1289169025,9906021841,-94109673529,99199171681,
 -84332740801,2327696411041,-4753075824025,
 46970592529,-48635546218561]