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A040872 as a simple table

na(n)
030
120
260
320
460
520
660
720
860
920
1060
1120
1260
1320
1460
1520
1660
1720
1860
1920
2060
2120
2260
2320
2460
2520
2660
2720
2860
2920
3060
3120
3260
3320
3460
3520
3660
3720
3860
3920
4060
4120
4260
4320
4460
4520
4660
4720
4860
4920
5060
5120
5260
5320
5460
5520
5660
5720
5860
5920
6060
6120
6260

[30,20,60,20,60,20,60,20,60,20,60,20,60,20,60,20,
 60,20,60,20,60,20,60,20,60,20,60,20,60,20,60,20,
 60,20,60,20,60,20,60,20,60,20,60,20,60,20,60,20,
 60,20,60,20,60,20,60,20,60,20,60,20,60,20,60]