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A025580 as a simple table

na(n)
01
10
21
35
413
5-1
641
7383
8901
9-47
101945
1126141
1229368
13-6359
14296509
15345525
16756291
17-197211
1810483329
19225371001
20242537898
21-3394965
22204481239
235215763433

[1,0,1,5,13,-1,41,383,901,-47,1945,26141,29368,
 -6359,296509,345525,756291,-197211,10483329,
 225371001,242537898,-3394965,204481239,5215763433]