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A305900 as a simple table

na(n)
11
22
33
44
55
66
75
87
98
109
115
1210
135
1411
1512
1613
175
1814
195
2015
2116
2217
235
2418
2519
2620
2721
2822
295
3023
315
3224
3325
3426
3527
3628
375
3829
3930
4031
415
4232
435
4433
4534
4635
475
4836
4937
5038
5139
5240
535
5441
5542
5643
5744
5845
595
6046
615
6247
6348
6449
6550
6651
675
6852
6953
7054
715
7255
735
7456
7557
7658
7759
7860
795
8061
8162
8263
835
8464
8565
8666
8767
8868
895
9069
9170
9271
9372
9473
9574
9675
975
9876

[1,2,3,4,5,6,5,7,8,9,5,10,5,11,12,13,5,14,5,15,16,
 17,5,18,19,20,21,22,5,23,5,24,25,26,27,28,5,29,30,
 31,5,32,5,33,34,35,5,36,37,38,39,40,5,41,42,43,44,
 45,5,46,5,47,48,49,50,51,5,52,53,54,5,55,5,56,57,
 58,59,60,5,61,62,63,5,64,65,66,67,68,5,69,70,71,
 72,73,74,75,5,76]