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A308468 as a simple table

na(n)
13
25
36
47
59
610
711
812
913
1014
1115
1217
1318
1419
1520
1621
1723
1824
1925
2027
2129
2230
2331
2433
2535
2636
2737
2839
2941
3042
3143
3245
3347
3448
3549
3651
3753

[3,5,6,7,9,10,11,12,13,14,15,17,18,19,20,21,23,24,
 25,27,29,30,31,33,35,36,37,39,41,42,43,45,47,48,
 49,51,53]