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A261568 as a simple table

na(n)
01
14
24
320
420
536
6100
7116
8180
9260
10580
11660
121044
131380
142020
153444
164340
176020
188260
1911220
2014740
2123140
2228196
2338900
2450420
2567780
2685956
27114900
28157140
29197860
30257060
31331060
32423540
33540100
34687620
35864084
361145300
371406500
381789860
392231860

[1,4,4,20,20,36,100,116,180,260,580,660,1044,1380,
 2020,3444,4340,6020,8260,11220,14740,23140,28196,
 38900,50420,67780,85956,114900,157140,197860,
 257060,331060,423540,540100,687620,864084,1145300,
 1406500,1789860,2231860]