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A281212 as a simple table

na(n)
01
13
26
315
424
560
698
7247
8400
91016
101540
113850
126547
1316382
1424577
1561443
16104454
17261131
18393748
19984358
201673471
214183296
226292352
2315729856
2426742624
2566853136
26100804520
27252008524
28428688626
291071148943
301610913872
314027278584
326846831492

[1,3,6,15,24,60,98,247,400,1016,1540,3850,6547,
 16382,24577,61443,104454,261131,393748,984358,
 1673471,4183296,6292352,15729856,26742624,
 66853136,100804520,252008524,428688626,1071148943,
 1610913872,4027278584,6846831492]