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A220521 as a simple table

na(n)
11
22
34
44
54
64
78
88
94
104
118
1212
1316
1412
1516
1616
174
184
198
2012
2116
2220
2324
2426
2524
2612
2720
2832
2940
3028
3132
3232
334
344
358
3612
3716
3820
3924
4026
4124
4220
4332
4444
4564
4652
4748
4854
4940
5012
5120
5236
5348
5456
5564
5674
5776
5830
5944
6072
6188
6260
6364
6464
654
664
678
6812

[1,2,4,4,4,4,8,8,4,4,8,12,16,12,16,16,4,4,8,12,16,
 20,24,26,24,12,20,32,40,28,32,32,4,4,8,12,16,20,
 24,26,24,20,32,44,64,52,48,54,40,12,20,36,48,56,
 64,74,76,30,44,72,88,60,64,64,4,4,8,12]