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A156662 as a simple table

na(n)
01
1-15
2-34
36435
413430
5-2340375
6-14583994
714371499355
829840056310
9-9461242548225
10-98219645304154
1176133279527323945
12474213708037394390
13-217208180302713714675
14-3156838199002472264314
1513347282999515974674162075
1627712196632736958626719670

[1,-15,-34,6435,13430,-2340375,-14583994,
 14371499355,29840056310,-9461242548225,
 -98219645304154,76133279527323945,
 474213708037394390,-217208180302713714675,
 -3156838199002472264314,
 13347282999515974674162075,
 27712196632736958626719670]