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A024003 as a simple table

na(n)
01
10
2-31
3-242
4-1023
5-3124
6-7775
7-16806
8-32767
9-59048
10-99999
11-161050
12-248831
13-371292
14-537823
15-759374
16-1048575
17-1419856
18-1889567
19-2476098
20-3199999
21-4084100
22-5153631
23-6436342
24-7962623
25-9765624
26-11881375
27-14348906
28-17210367
29-20511148

[1,0,-31,-242,-1023,-3124,-7775,-16806,-32767,
 -59048,-99999,-161050,-248831,-371292,-537823,
 -759374,-1048575,-1419856,-1889567,-2476098,
 -3199999,-4084100,-5153631,-6436342,-7962623,
 -9765624,-11881375,-14348906,-17210367,-20511148]