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A000064 as a simple table

na(n)
01
12
24
36
49
513
618
724
831
939
1050
1162
1277
1393
14112
15134
16159
17187
18218
19252
20292
21335
22384
23436
24494
25558
26628
27704
28786
29874
30972
311076
321190
331310
341440
351580
361730
371890
382060
392240
402435
412640
422860
433090
443335
453595
463870
474160
484465
494785
505126

[1,2,4,6,9,13,18,24,31,39,50,62,77,93,112,134,159,
 187,218,252,292,335,384,436,494,558,628,704,786,
 874,972,1076,1190,1310,1440,1580,1730,1890,2060,
 2240,2435,2640,2860,3090,3335,3595,3870,4160,4465,
 4785,5126]