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A010870 as a simple table

na(n)
031
131
231
331
431
531
631
731
831
931
1031
1131
1231
1331
1431
1531
1631
1731
1831
1931
2031
2131
2231
2331
2431
2531
2631
2731
2831
2931
3031
3131
3231
3331
3431
3531
3631
3731
3831
3931
4031
4131
4231
4331
4431
4531
4631
4731
4831
4931
5031
5131
5231
5331

[31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,
 31,31,31,31,31,31]