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A261239 as a simple table

na(n)
01
1-3
20
3-4
4-21
5-129
6-910
7-7242
8-64155
9-626319
10-6685548
11-77527104
12-971315713
13-13084909917
14-188723009274
15-2902997766470
16-47458671376503
17-821951603042523
18-15037432614035864
19-289828080356525052
20-5870642802374608509
21-124691017072423632777

[1,-3,0,-4,-21,-129,-910,-7242,-64155,-626319,
 -6685548,-77527104,-971315713,-13084909917,
 -188723009274,-2902997766470,-47458671376503,
 -821951603042523,-15037432614035864,
 -289828080356525052,-5870642802374608509,
 -124691017072423632777]