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A180339 as a simple table

na(n)
01
12
21
34
41
53
68
72
83
98
1016
114
126
138
1421
1532
168
1712
1816
1921
2055
2164
2216
2324
2432
2542
2655
27144
28128
2932
3048
3164
3284
33110
34144
35377
36256
3764
3896
39128
40168
41220
42288
43377
44987

[1,2,1,4,1,3,8,2,3,8,16,4,6,8,21,32,8,12,16,21,55,
 64,16,24,32,42,55,144,128,32,48,64,84,110,144,377,
 256,64,96,128,168,220,288,377,987]