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A319931 as a simple table

na(n)
00
11
22
30
4-4
5-6
60
721
864
9135
10238
11374
12540
13728
14924
151107
161248
171309
181242
19988
20476
21-378
22-1672
23-3519
24-6048
25-9405
26-13754
27-19278
28-26180
29-34684
30-45036
31-57505
32-72384
33-89991
34-110670
35-134792
36-162756
37-194990
38-231952
39-274131
40-322048
41-376257

[0,1,2,0,-4,-6,0,21,64,135,238,374,540,728,924,
 1107,1248,1309,1242,988,476,-378,-1672,-3519,
 -6048,-9405,-13754,-19278,-26180,-34684,-45036,
 -57505,-72384,-89991,-110670,-134792,-162756,
 -194990,-231952,-274131,-322048,-376257]