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A049072 as a simple table

na(n)
01
13
25
33
4-11
5-45
6-91
7-93
885
9627
101541
112115
12181
13-7917
14-24475
15-41757
16-27371
1784915
18364229
19753027
20802165
21-605613
22-5025499
23-12654045
24-17860139
25-2964237
2662547845
27199500483
28348310069
29246928275
30-652455451
31-2945079453
32-6225416555

[1,3,5,3,-11,-45,-91,-93,85,627,1541,2115,181,
 -7917,-24475,-41757,-27371,84915,364229,753027,
 802165,-605613,-5025499,-12654045,-17860139,
 -2964237,62547845,199500483,348310069,246928275,
 -652455451,-2945079453,-6225416555]