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A088139 as a simple table

na(n)
00
11
22
3-2
4-16
5-20
656
7232
8128
9-1136
10-3040
11736
1219712
1335008
14-48256
15-306560
16-323584
171192192
184325888
191498624
20-22958080
21-54907904
2227932672
23385312768
24603029504
25-1105817600
26-5829812224
27-5024718848
2824929435648
2980007184384

[0,1,2,-2,-16,-20,56,232,128,-1136,-3040,736,
 19712,35008,-48256,-306560,-323584,1192192,
 4325888,1498624,-22958080,-54907904,27932672,
 385312768,603029504,-1105817600,-5829812224,
 -5024718848,24929435648,80007184384]