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A302486 as a simple table

na(n)
12
22
34
45
56
68
710
812
915
1017
1120
1223
1326
1430
1533
1636
1740
1845
1949
2054
2158
2263
2369
2474

[2,2,4,5,6,8,10,12,15,17,20,23,26,30,33,36,40,45,
 49,54,58,63,69,74]