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A331774 as a simple table

na(n)
10
20
30
420
556
6108
7208
8340
9504
10788
111136
121548
132136
142820
153600
164748
176056
187524
199312
2011292
2113464
2216380
2319584
2423076
2527272
2631820
2736720
2842668
2949064
3055908
3163712
3272028
3380856
3491596
35103008
36115092
37128456
38142556
39157392
40174932
41193400

[0,0,0,20,56,108,208,340,504,788,1136,1548,2136,
 2820,3600,4748,6056,7524,9312,11292,13464,16380,
 19584,23076,27272,31820,36720,42668,49064,55908,
 63712,72028,80856,91596,103008,115092,128456,
 142556,157392,174932,193400]