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A040418 as a simple table

na(n)
020
11
219
31
440
51
619
71
840
91
1019
111
1240
131
1419
151
1640
171
1819
191
2040
211
2219
231
2440
251
2619
271
2840
291
3019
311
3240
331
3419
351
3640
371
3819
391
4040
411
4219
431
4440
451
4619
471
4840
491
5019
511
5240
531
5419
551
5640
571
5819
591
6040
611
6219
631
6440
651
6619
671
6840
691
7019
711
7240
731
7419

[20,1,19,1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19,
 1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19,
 1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19,
 1,40,1,19,1,40,1,19,1,40,1,19,1,40,1,19]