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A225773 as a simple table

na(n)
12
24
36
48
59
611
713
815
918
1020
1122
1224
1325
1427
1529
1631
1734
1836
1938
2040
2141
2243
2345
2447
2550
2652
2754
2856
2957
3059
3161
3263

[2,4,6,8,9,11,13,15,18,20,22,24,25,27,29,31,34,36,
 38,40,41,43,45,47,50,52,54,56,57,59,61,63]