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A320608 as a simple table

na(n)
11
23
36
412
520
629
747
871
9104
10150
11213
12292
13405
14547
15736
16977
171292
181688
192198
202834
213638
224636
235890
247431
259347
2611684
2714564
2818067
2922348
3027531
3133813
3241378
3350504
3461438
3574561
3690208
37108896
38131096
39157485
40188717
41225682
42269285
43320691

[1,3,6,12,20,29,47,71,104,150,213,292,405,547,736,
 977,1292,1688,2198,2834,3638,4636,5890,7431,9347,
 11684,14564,18067,22348,27531,33813,41378,50504,
 61438,74561,90208,108896,131096,157485,188717,
 225682,269285,320691]