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A033740 as a simple table

na(n)
01
12
22
34
44
54
68
710
810
910
1016
1112
1216
1328
1418
1524
1628
1732
1826
1936
2048
2128
2260
2352
2456
2558
2664
2788
2868
29100
3072
3196
3286
33104
34144
3592
36132
37116
38152
39120
40168
41184
42136
43220
44168
45228
46172
47240
48280
49234
50282
51208

[1,2,2,4,4,4,8,10,10,10,16,12,16,28,18,24,28,32,
 26,36,48,28,60,52,56,58,64,88,68,100,72,96,86,104,
 144,92,132,116,152,120,168,184,136,220,168,228,
 172,240,280,234,282,208]