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A293573 as a simple table

na(n)
01
11
2-1
3-5
41
541
6751
7-461
8-61375
9-114479
103197791
1151784811
1295861569
13-13289759495
14-88386566449
151959369708451
1639596487031681
17144047673616289
18-17707296608390465
19-244965944457878309
205109519579305499521
21149507697206554889161

[1,1,-1,-5,1,41,751,-461,-61375,-114479,3197791,
 51784811,95861569,-13289759495,-88386566449,
 1959369708451,39596487031681,144047673616289,
 -17707296608390465,-244965944457878309,
 5109519579305499521,149507697206554889161]