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A182228 as a simple table

na(n)
00
11
2-1
34
4-7
519
6-40
797
8-217
9508
10-1159
112683
12-6160
1314209
14-32689
1575316
16-173383
17399331
18-919480
192117473
20-4875913
2111228332
22-25856071
2359541067
24-137109280
25315732481
26-727060321
271674257764
28-3855438727
298878212019
30-20444528200
3147079164257
32-108412748857

[0,1,-1,4,-7,19,-40,97,-217,508,-1159,2683,-6160,
 14209,-32689,75316,-173383,399331,-919480,2117473,
 -4875913,11228332,-25856071,59541067,-137109280,
 315732481,-727060321,1674257764,-3855438727,
 8878212019,-20444528200,47079164257,-108412748857]