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A056942 as a simple table

na(n)
00
11
22
34
46
56
69
712
812
912
1016
1120
1220
1320
1420
1525
1630
1730
1830
1930
2030
2136
2242
2342
2442
2542
2642
2742
2849
2956
3056
3156
3256
3356
3456
3556
3664
3772
3872
3972
4072
4172
4272
4372
4472
4581
4690
4790
4890
4990
5090
5190
5290
5390
5490
55100
56110
57110
58110
59110
60110
61110
62110
63110
64110
65110
66121

[0,1,2,4,6,6,9,12,12,12,16,20,20,20,20,25,30,30,
 30,30,30,36,42,42,42,42,42,42,49,56,56,56,56,56,
 56,56,64,72,72,72,72,72,72,72,72,81,90,90,90,90,
 90,90,90,90,90,100,110,110,110,110,110,110,110,
 110,110,110,121]