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A120558 as a simple table

na(n)
12
20
34
48
52
624
720
818
988
1040
11108
12246
1386
14408
15612
16242
171350
181224
19968
203540
212840
222884
239176
244812
2511314
2617604
2716484
2822376
2946602
3026128
3188204
3243816
33153144
3473004
35275012
36103868
37604014
38-198132
391533348
40-605098

[2,0,4,8,2,24,20,18,88,40,108,246,86,408,612,242,
 1350,1224,968,3540,2840,2884,9176,4812,11314,
 17604,16484,22376,46602,26128,88204,43816,153144,
 73004,275012,103868,604014,-198132,1533348,
 -605098]