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A131386 as a simple table

na(n)
11
20
3-3
48
5-15
624
7-35
848
9-63
1080
11-99
12120
13-143
14168
15-195
16224
17-255
18288
19-323
20360
21-399
22440
23-483
24528
25-575
26624
27-675
28728
29-783
30840
31-899
32960
33-1023
341088
35-1155
361224
37-1295
381368
39-1443
401520
41-1599
421680
43-1763
441848
45-1935
462024
47-2115
482208
49-2303
502400

[1,0,-3,8,-15,24,-35,48,-63,80,-99,120,-143,168,
 -195,224,-255,288,-323,360,-399,440,-483,528,-575,
 624,-675,728,-783,840,-899,960,-1023,1088,-1155,
 1224,-1295,1368,-1443,1520,-1599,1680,-1763,1848,
 -1935,2024,-2115,2208,-2303,2400]