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A047001 as a simple table

na(n)
01
12
23
36
48
515
630
752
8101
9202
10376
11740
121480
132840
145625
1511250
1621928
1743583
1887166
19171420
20341412
21682824
221350144
232692536
245385072
2510684872
2621326481
2742652962
2884825224
29169403773
30338807546
31674852332
321348273949

[1,2,3,6,8,15,30,52,101,202,376,740,1480,2840,
 5625,11250,21928,43583,87166,171420,341412,682824,
 1350144,2692536,5385072,10684872,21326481,
 42652962,84825224,169403773,338807546,674852332,
 1348273949]