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A226235 as a simple table

na(n)
11
2-12
366
4-220
5495
6-804
71068
8-1596
93279
10-6952
1112276
12-17844
1323653
14-34080
1557168
16-98428
17154332
18-215724
19285388
20-395784
21600459
22-931888
231365696
24-1853076
252426189
26-3277896
274689534
28-6815008
299538632
30-12664440
3116403188
32-21690876
3329812932

[1,-12,66,-220,495,-804,1068,-1596,3279,-6952,
 12276,-17844,23653,-34080,57168,-98428,154332,
 -215724,285388,-395784,600459,-931888,1365696,
 -1853076,2426189,-3277896,4689534,-6815008,
 9538632,-12664440,16403188,-21690876,29812932]