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A001400 as a simple table

na(n)
01
11
22
33
45
56
69
711
815
918
1023
1127
1234
1339
1447
1554
1664
1772
1884
1994
20108
21120
22136
23150
24169
25185
26206
27225
28249
29270
30297
31321
32351
33378
34411
35441
36478
37511
38551
39588
40632
41672
42720
43764
44816
45864
46920
47972
481033
491089
501154
511215
521285
531350
541425
551495

[1,1,2,3,5,6,9,11,15,18,23,27,34,39,47,54,64,72,
 84,94,108,120,136,150,169,185,206,225,249,270,297,
 321,351,378,411,441,478,511,551,588,632,672,720,
 764,816,864,920,972,1033,1089,1154,1215,1285,1350,
 1425,1495]