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A336970 as a simple table

na(n)
01
10
2-1
3-1
40
53
69
716
87
9-87
10-472
11-1567
12-3375
13-216
1445927
15308107
161372744
174351599
185711849
19-49345432
20-547773585
21-3517370859
22-16914970464
23-56474505155
24-25470754271
251593389360016
2617323737305039
27125785962635543
28706598399399184

[1,0,-1,-1,0,3,9,16,7,-87,-472,-1567,-3375,-216,
 45927,308107,1372744,4351599,5711849,-49345432,
 -547773585,-3517370859,-16914970464,-56474505155,
 -25470754271,1593389360016,17323737305039,
 125785962635543,706598399399184]