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A040381 as a simple table

na(n)
020
120
240
320
440
520
640
720
840
920
1040
1120
1240
1320
1440
1520
1640
1720
1840
1920
2040
2120
2240
2320
2440
2520
2640
2720
2840
2920
3040
3120
3240
3320
3440
3520
3640
3720
3840
3920
4040
4120
4240
4320
4440
4520
4640
4720
4840
4920
5040
5120
5240
5320
5440
5520
5640
5720
5840
5920
6040
6120
6240

[20,20,40,20,40,20,40,20,40,20,40,20,40,20,40,20,
 40,20,40,20,40,20,40,20,40,20,40,20,40,20,40,20,
 40,20,40,20,40,20,40,20,40,20,40,20,40,20,40,20,
 40,20,40,20,40,20,40,20,40,20,40,20,40,20,40]