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A156550 as a simple table

na(n)
05
10
210
3-10
430
5-50
6110
7-210
8430
9-850
101710
11-3410
126830
13-13650
1427310
15-54610
16109230
17-218450
18436910
19-873810
201747630
21-3495250
226990510
23-13981010
2427962030
25-55924050
26111848110
27-223696210
28447392430
29-894784850
301789569710
31-3579139410

[5,0,10,-10,30,-50,110,-210,430,-850,1710,-3410,
 6830,-13650,27310,-54610,109230,-218450,436910,
 -873810,1747630,-3495250,6990510,-13981010,
 27962030,-55924050,111848110,-223696210,447392430,
 -894784850,1789569710,-3579139410]