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A006697 as a simple table

na(n)
01
12
24
36
49
513
617
722
828
935
1043
1151
1260
1370
1481
1593
16106
17120
18135
19151
20167
21184
22202
23221
24241
25262
26284
27307
28331
29356
30382
31409
32437
33466
34496
35527
36559
37591
38624
39658
40693
41729
42766
43804
44843
45883
46924
47966
481009
491053
501098
511144
521191
531239

[1,2,4,6,9,13,17,22,28,35,43,51,60,70,81,93,106,
 120,135,151,167,184,202,221,241,262,284,307,331,
 356,382,409,437,466,496,527,559,591,624,658,693,
 729,766,804,843,883,924,966,1009,1053,1098,1144,
 1191,1239]