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A308987 as a simple table

na(n)
11
22
34
410
514
616
720
834
940
1046
1188
12100
13112
14130
15152
16212
17288
18330
19346
20444
21502
22526
23534
24564
25580
26614
27624
28634
29636
30640
31690

[1,2,4,10,14,16,20,34,40,46,88,100,112,130,152,
 212,288,330,346,444,502,526,534,564,580,614,624,
 634,636,640,690]