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A137939 as a simple table

na(n)
10
20
354
424
5180
6216
7546
8336
9648
10720
11990
12936
131404
142352
151890
161824
172448
182592
193078
203720
214284
223960
234554
244464
255400
265616
276318
287896
297308
307560
318370
328256
339504
349792
3511550
3610584
3711988
3812312
3913338
4014640
4114760
4217640
4316254
4416104
4517820
4618216
4719458
4819296
4922344
5021600

[0,0,54,24,180,216,546,336,648,720,990,936,1404,
 2352,1890,1824,2448,2592,3078,3720,4284,3960,4554,
 4464,5400,5616,6318,7896,7308,7560,8370,8256,9504,
 9792,11550,10584,11988,12312,13338,14640,14760,
 17640,16254,16104,17820,18216,19458,19296,22344,
 21600]