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A307974 as a simple table

na(n)
01
11
2-4
32
4-38
53
6-73
74
8-68
95
10-179
116
12-9218
137
14-19
158
16-3976
179
1818143
1910
20-89038
2111
22426463
2312
24-118199108
2513
264276511
2714
28-11874736822
2915
304307920527007
3116
32-3854660524816
3317
341288843929131
3518
36-13157635776544491194
3719
381464996956920721
3920
40-130541359248224699708

[1,1,-4,2,-38,3,-73,4,-68,5,-179,6,-9218,7,-19,8,
 -3976,9,18143,10,-89038,11,426463,12,-118199108,
 13,4276511,14,-11874736822,15,4307920527007,16,
 -3854660524816,17,1288843929131,18,
 -13157635776544491194,19,1464996956920721,20,
 -130541359248224699708]