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A028787 as a simple table

na(n)
12
25
36
48
513
614
715
817
918
1019
1120
1222
1323
1424
1529
1631
1732
1835
1939
2042
2143
2245
2350
2451
2552
2654
2755
2856
2957
3059
3160
3261
3366
3468
3569
3672

[2,5,6,8,13,14,15,17,18,19,20,22,23,24,29,31,32,
 35,39,42,43,45,50,51,52,54,55,56,57,59,60,61,66,
 68,69,72]