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A121901 as a simple table

na(n)
00
15
28
310
411
513
614
715
816
917
1018
1119
1220
1321
1421
1522
1623
1724
1824
1925
2026
2126
2227
2328
2428
2529
2629
2730
2831
2931
3032
3132
3233
3333
3434
3534
3635
3735
3836
3936
4037
4137
4237
4338
4438
4539
4639
4740
4840
4941
5041
5141
5242
5342
5443
5543
5643
5744
5844
5945
6045
6145
6246
6346
6446
6547
6647
6747
6848
6948

[0,5,8,10,11,13,14,15,16,17,18,19,20,21,21,22,23,
 24,24,25,26,26,27,28,28,29,29,30,31,31,32,32,33,
 33,34,34,35,35,36,36,37,37,37,38,38,39,39,40,40,
 41,41,41,42,42,43,43,43,44,44,45,45,45,46,46,46,
 47,47,47,48,48]