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A206818 as a simple table

na(n)
13
24
36
48
510
612
713
816
918
1020
1121
1224
1325
1427
1529
1632
1733
1835
1937
2038
2141
2243
2345
2446
2548
2651
2753
2855
2957
3059
3161
3262
3364
3466
3569
3671
3773
3874
3976
4079
4181
4282
4384
4486
4588
4690
4792
4894
4995
5097
51100
52102
53104
54106
55107
56110
57112
58114
59116
60118
61120
62122
63123

[3,4,6,8,10,12,13,16,18,20,21,24,25,27,29,32,33,
 35,37,38,41,43,45,46,48,51,53,55,57,59,61,62,64,
 66,69,71,73,74,76,79,81,82,84,86,88,90,92,94,95,
 97,100,102,104,106,107,110,112,114,116,118,120,
 122,123]