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A303642 as a simple table

na(n)
10
20
30
420
520
628
764
872
980
1080
11148
12148
13156
14248
15256
16264
17264
18380
19396
20404
21528
22552
23560
24700
25716
26740
27764
28928
29936
30960
311148
321180
331196
341212
351440
361448
371472
381700
391740
401764
412000
422040
432064
442104
452380
462396
472428
482720
492760
502784
512832
523156

[0,0,0,20,20,28,64,72,80,80,148,148,156,248,256,
 264,264,380,396,404,528,552,560,700,716,740,764,
 928,936,960,1148,1180,1196,1212,1440,1448,1472,
 1700,1740,1764,2000,2040,2064,2104,2380,2396,2428,
 2720,2760,2784,2832,3156]