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A321773 as a simple table

na(n)
31
43
56
64
79
89
910
1012
1115
1213
1318
1418
1519
1621
1724
1822
1927
2027
2128
2230
2333
2431
2536
2636
2737
2839
2942
3040
3145
3245
3346
3448
3551
3649
3754
3854
3955
4057
4160
4258
4363
4463
4564
4666
4769
4867
4972
5072
5173
5275
5378
5476
5581
5681
5782
5884
5987
6085
6190
6290
6391
6493
6596
6694
6799
6899

[1,3,6,4,9,9,10,12,15,13,18,18,19,21,24,22,27,27,
 28,30,33,31,36,36,37,39,42,40,45,45,46,48,51,49,
 54,54,55,57,60,58,63,63,64,66,69,67,72,72,73,75,
 78,76,81,81,82,84,87,85,90,90,91,93,96,94,99,99]