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A320070 as a simple table

na(n)
01
1-2
22
3-6
414
5-20
632
7-60
898
9-150
10232
11-360
12558
13-828
141196
15-1776
162614
17-3700
185238
19-7480
2010516
21-14592
2220180
23-27832
2438216
25-51970
2670184
27-94842
28127612
29-170140
30226164
31-300324
32396754
33-521520
34683484
35-893432
361164330
37-1511188
381954756
39-2524188

[1,-2,2,-6,14,-20,32,-60,98,-150,232,-360,558,
 -828,1196,-1776,2614,-3700,5238,-7480,10516,
 -14592,20180,-27832,38216,-51970,70184,-94842,
 127612,-170140,226164,-300324,396754,-521520,
 683484,-893432,1164330,-1511188,1954756,-2524188]