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A139570 as a simple table

na(n)
00
18
220
336
456
580
6108
7140
8176
9216
10260
11308
12360
13416
14476
15540
16608
17680
18756
19836
20920
211008
221100
231196
241296
251400
261508
271620
281736
291856
301980
312108
322240
332376
342516
352660
362808
372960
383116
393276
403440
413608
423780
433956
444136
454320
464508
474700
484896

[0,8,20,36,56,80,108,140,176,216,260,308,360,416,
 476,540,608,680,756,836,920,1008,1100,1196,1296,
 1400,1508,1620,1736,1856,1980,2108,2240,2376,2516,
 2660,2808,2960,3116,3276,3440,3608,3780,3956,4136,
 4320,4508,4700,4896]