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A171943 as a simple table

na(n)
11
21
32
44
512
616
718
824
940
1056
1156
1286
13134
14140
15144
16144
17148
18152
19160
20162
21162
22164
23166
24170
25176
26176
27182
28188
29190
30198
31198
32206
33222
34234
35238
36246
37262
38274
39278
40286
41302
42320
43326
44326
45344
46362
47374
48380
49392
50392
51398
52404

[1,1,2,4,12,16,18,24,40,56,56,86,134,140,144,144,
 148,152,160,162,162,164,166,170,176,176,182,188,
 190,198,198,206,222,234,238,246,262,274,278,286,
 302,320,326,326,344,362,374,380,392,392,398,404]