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A002131 as a simple table

na(n)
11
22
34
44
56
68
78
88
913
1012
1112
1216
1314
1416
1524
1616
1718
1826
1920
2024
2132
2224
2324
2432
2531
2628
2740
2832
2930
3048
3132
3232
3348
3436
3548
3652
3738
3840
3956
4048
4142
4264
4344
4448
4578
4648
4748
4864
4957
5062
5172
5256
5354
5480
5572
5664
5780
5860
5960
6096
6162
6264
63104
6464
6584
6696
6768
6872
6996
7096
7172

[1,2,4,4,6,8,8,8,13,12,12,16,14,16,24,16,18,26,20,
 24,32,24,24,32,31,28,40,32,30,48,32,32,48,36,48,
 52,38,40,56,48,42,64,44,48,78,48,48,64,57,62,72,
 56,54,80,72,64,80,60,60,96,62,64,104,64,84,96,68,
 72,96,96,72]