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A024031 as a simple table

na(n)
01
12
2-247
3-6534
4-65455
5-390382
6-1678887
7-5762614
8-16770655
9-43027038
10-99940951
11-214181734
12-429450255
13-814136398
14-1471006087
15-2548541718
16-4251920575
17-6846617278
18-10632540087
19-15821301574
20-22113215599

[1,2,-247,-6534,-65455,-390382,-1678887,-5762614,
 -16770655,-43027038,-99940951,-214181734,
 -429450255,-814136398,-1471006087,-2548541718,
 -4251920575,-6846617278,-10632540087,-15821301574,
 -22113215599]