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A040420 as a simple table

na(n)
021
142
242
342
442
542
642
742
842
942
1042
1142
1242
1342
1442
1542
1642
1742
1842
1942
2042
2142
2242
2342
2442
2542
2642
2742
2842
2942
3042
3142
3242
3342
3442
3542
3642
3742
3842
3942
4042
4142
4242
4342
4442
4542
4642
4742
4842
4942
5042
5142
5242
5342
5442
5542
5642
5742
5842
5942
6042
6142
6242

[21,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,
 42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,
 42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,42,
 42,42,42,42,42,42,42,42,42,42,42,42,42,42,42]