| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 21 |
| 2 | 84 |
| 3 | 189 |
| 4 | 336 |
| 5 | 525 |
| 6 | 756 |
| 7 | 1029 |
| 8 | 1344 |
| 9 | 1701 |
| 10 | 2100 |
| 11 | 2541 |
| 12 | 3024 |
| 13 | 3549 |
| 14 | 4116 |
| 15 | 4725 |
| 16 | 5376 |
| 17 | 6069 |
| 18 | 6804 |
| 19 | 7581 |
| 20 | 8400 |
| 21 | 9261 |
| 22 | 10164 |
| 23 | 11109 |
| 24 | 12096 |
| 25 | 13125 |
| 26 | 14196 |
| 27 | 15309 |
| 28 | 16464 |
| 29 | 17661 |
| 30 | 18900 |
| 31 | 20181 |
| 32 | 21504 |
| 33 | 22869 |
| 34 | 24276 |
| 35 | 25725 |
| 36 | 27216 |
| 37 | 28749 |
[0,21,84,189,336,525,756,1029,1344,1701,2100,2541, 3024,3549,4116,4725,5376,6069,6804,7581,8400,9261, 10164,11109,12096,13125,14196,15309,16464,17661, 18900,20181,21504,22869,24276,25725,27216,28749] |