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A174016 as a simple table

na(n)
01
12
26
316
440
592
6192
7352
8528
9512
10-192
11-2128
12-3840
135888
1469056
15299264
16917760
172125184
183258368
19-117760
20-23297536
21-103321600
22-295843840
23-577744128
24-416948224
252490589184
2614821469184
2750063536128

[1,2,6,16,40,92,192,352,528,512,-192,-2128,-3840,
 5888,69056,299264,917760,2125184,3258368,-117760,
 -23297536,-103321600,-295843840,-577744128,
 -416948224,2490589184,14821469184,50063536128]