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A039731 as a simple table

na(n)
21
32
42
54
66
76
88
910
1012
1114
1218
1318
1420
1518
1624
1728
1830
1930
2034
2136
2238
2340
2442
2544
2648
2750
2848
2950
3054
3160
3264
3366
3468
3570
3672
3778
3880
3978
4084
4182
4284
4394
4496
4596
4698
47104
48110
49100
50102
51106
52112
53114
54124
55126
56126
57132
58134
59138
60132
61134
62144
63150

[1,2,2,4,6,6,8,10,12,14,18,18,20,18,24,28,30,30,
 34,36,38,40,42,44,48,50,48,50,54,60,64,66,68,70,
 72,78,80,78,84,82,84,94,96,96,98,104,110,100,102,
 106,112,114,124,126,126,132,134,138,132,134,144,
 150]