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A121621 as a simple table

na(n)
01
12
2-5
3-46
4-119
5122
62035
76554
8-239
9-86158
10-341525
11-246046
123455641
1317021162
1423161315
15-128629846
16-815616479
17-1590277918
184241902555
1937641223154
2095420159401
21-107655263398
22-1671083125805
23-5284814079046
24584824319281

[1,2,-5,-46,-119,122,2035,6554,-239,-86158,
 -341525,-246046,3455641,17021162,23161315,
 -128629846,-815616479,-1590277918,4241902555,
 37641223154,95420159401,-107655263398,
 -1671083125805,-5284814079046,584824319281]