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A316464 as a simple table

na(n)
01
1-5
20
325
45
5-51
6-120
70
8325
9500
10273
11-1000
12-2475
13-2575
14610
157449
1613885
1713275
18-3650
19-37005
20-73075
21-78475
22-16450
23130600
24326860
25452704
26339375
27-174900
28-1082100
29-2092990
30-2553196
31-1602400
321426925
336411775
3411803520
3514448032
3610108055

[1,-5,0,25,5,-51,-120,0,325,500,273,-1000,-2475,
 -2575,610,7449,13885,13275,-3650,-37005,-73075,
 -78475,-16450,130600,326860,452704,339375,-174900,
 -1082100,-2092990,-2553196,-1602400,1426925,
 6411775,11803520,14448032,10108055]