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A263511 as a simple table

na(n)
01
13
26
312
419
529
640
754
869
987
10106
11128
12151
13177
14204
15234
16265
17299
18334
19372
20411
21453
22496
23542
24589
25639
26690
27744
28799
29857
30916
31978
321041
331107
341174
351244
361315
371389
381464
391542
401621
411703
421786
431872
441959
452049
462140
472234
482329
492427

[1,3,6,12,19,29,40,54,69,87,106,128,151,177,204,
 234,265,299,334,372,411,453,496,542,589,639,690,
 744,799,857,916,978,1041,1107,1174,1244,1315,1389,
 1464,1542,1621,1703,1786,1872,1959,2049,2140,2234,
 2329,2427]