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A140360 as a simple table

na(n)
01
10
25
3-5
415
5-25
655
7-105
8215
9-425
10855
11-1705
123415
13-6825
1413655
15-27305
1654615
17-109225
18218455
19-436905
20873815
21-1747625
223495255
23-6990505
2413981015
25-27962025
2655924055
27-111848105
28223696215
29-447392425
30894784855
31-1789569705
323579139415

[1,0,5,-5,15,-25,55,-105,215,-425,855,-1705,3415,
 -6825,13655,-27305,54615,-109225,218455,-436905,
 873815,-1747625,3495255,-6990505,13981015,
 -27962025,55924055,-111848105,223696215,
 -447392425,894784855,-1789569705,3579139415]