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A138976 as a simple table

na(n)
00
1-3
2-18
3-45
4-192
5-459
6-1914
7-4557
8-18960
9-45123
10-187698
11-446685
12-1858032
13-4421739
14-18392634
15-43770717
16-182068320
17-433285443
18-1802290578
19-4289083725
20-17840837472
21-42457551819
22-176606084154
23-420286434477
24-1748220004080
25-4160406792963

[0,-3,-18,-45,-192,-459,-1914,-4557,-18960,-45123,
 -187698,-446685,-1858032,-4421739,-18392634,
 -43770717,-182068320,-433285443,-1802290578,
 -4289083725,-17840837472,-42457551819,
 -176606084154,-420286434477,-1748220004080,
 -4160406792963]