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A333637 as a simple table

na(n)
10
20
30
42
57
615
727
841
957
1075
1195
12117
13141
14167
15195
16225
17257
18291
19327
20365
21405
22447
23491
24537
25585
26635
27687
28741
29797
30855
31915
32977
331041
341107
351175
361245
371317
381391
391467
401545
411625
421707
431791
441877
451965
462055
472147
482241
492337
502435
512535
522637
532741
542847
552955
563065
573177
583291
593407
603525

[0,0,0,2,7,15,27,41,57,75,95,117,141,167,195,225,
 257,291,327,365,405,447,491,537,585,635,687,741,
 797,855,915,977,1041,1107,1175,1245,1317,1391,
 1467,1545,1625,1707,1791,1877,1965,2055,2147,2241,
 2337,2435,2535,2637,2741,2847,2955,3065,3177,3291,
 3407,3525]