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A033720 as a simple table

na(n)
01
12
22
34
44
54
68
78
88
910
1012
1112
1216
1320
1416
1524
1624
1720
1826
1920
2024
2132
2224
2324
2432
2530
2628
2740
2832
2920
3048
3132
3224
3348
3436
3548
3652
3736
3840
3956
4048
4152
4264
4344
4448
4584
4648
4748
4896
4950
5062
5172
5256
5368
5480
5572
5664

[1,2,2,4,4,4,8,8,8,10,12,12,16,20,16,24,24,20,26,
 20,24,32,24,24,32,30,28,40,32,20,48,32,24,48,36,
 48,52,36,40,56,48,52,64,44,48,84,48,48,96,50,62,
 72,56,68,80,72,64]