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A261240 as a simple table

na(n)
01
12
24
39
416
528
647
776
8120
9185
10280
11416
12608
13878
141252
151765
162464
173408
184676
196364
208600
2111545
2215400
2320424
2426938
2535346
2646152
2759981
2877616
29100016
30128369
31164140
32209120
33265510
34335992
35423840
36533035
37668404
38835804
391042308
401296448

[1,2,4,9,16,28,47,76,120,185,280,416,608,878,1252,
 1765,2464,3408,4676,6364,8600,11545,15400,20424,
 26938,35346,46152,59981,77616,100016,128369,
 164140,209120,265510,335992,423840,533035,668404,
 835804,1042308,1296448]