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A307660 as a simple table

na(n)
01
1-1
2-1
3-1
4-23
5139
6-929
712011
8-54319
9664343
107497631
1117751799
12-1294263431
1313183537379
14335384855807
15-8293330879261
1626192873684641
17-1587651616174289
1812035003736999871
19-887536237005983377
2013114291271436277001
21-332542758207041951941
222683832751567973018399

[1,-1,-1,-1,-23,139,-929,12011,-54319,664343,
 7497631,17751799,-1294263431,13183537379,
 335384855807,-8293330879261,26192873684641,
 -1587651616174289,12035003736999871,
 -887536237005983377,13114291271436277001,
 -332542758207041951941,2683832751567973018399]