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A263021 as a simple table

na(n)
01
12
24
34
46
58
69
710
88
914
1014
1116
1216
1316
1420
1518
1622
1724
1821
1926
2028
2128
2228
2324
2436
2534
2636
2738
2832
2932
3040
3142
3244
3336
3446
3556
3643
3750
3840
3952
4054
4156
4254
4342
4460
4562
4664
4764
4856
4966
5056
5172
5270
5356
5474
5574
5676
5772
5864
5980
6081
6184
6284
6364
6476
6588
6688

[1,2,4,4,6,8,9,10,8,14,14,16,16,16,20,18,22,24,21,
 26,28,28,28,24,36,34,36,38,32,32,40,42,44,36,46,
 56,43,50,40,52,54,56,54,42,60,62,64,64,56,66,56,
 72,70,56,74,74,76,72,64,80,81,84,84,64,76,88,88]