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A290768 as a simple table

na(n)
13
26
312
421
533
648
766
887
9111
10138
11168
12201
13237
14276
15318
16363
17411
18462
19516
20573
21633
22696
23762
24831
25903
26978
271056
281137
291221
301308
311398
321491
331587
341686
351788
361893
372001
382112
392226
402343
412463
422586
432712
442841
452973
463108
473246
483387
493531
503678

[3,6,12,21,33,48,66,87,111,138,168,201,237,276,
 318,363,411,462,516,573,633,696,762,831,903,978,
 1056,1137,1221,1308,1398,1491,1587,1686,1788,1893,
 2001,2112,2226,2343,2463,2586,2712,2841,2973,3108,
 3246,3387,3531,3678]