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A015690 as a simple table

na(n)
01
1-13
2195
3-3315
462673
5-1299285
629228355
7-707636475
818316505025
9-504116658045
1014685387955875
11-451033728019875
1214555826008348625
13-492141539705941125
1417387673626552904675
15-640456882350467056875

[1,-13,195,-3315,62673,-1299285,29228355,
 -707636475,18316505025,-504116658045,
 14685387955875,-451033728019875,14555826008348625,
 -492141539705941125,17387673626552904675,
 -640456882350467056875]