| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 84 |
| 3 | 300 |
| 4 | 825 |
| 5 | 1911 |
| 6 | 3920 |
| 7 | 7344 |
| 8 | 12825 |
| 9 | 21175 |
| 10 | 33396 |
| 11 | 50700 |
| 12 | 74529 |
| 13 | 106575 |
| 14 | 148800 |
| 15 | 203456 |
| 16 | 273105 |
| 17 | 360639 |
| 18 | 469300 |
| 19 | 602700 |
| 20 | 764841 |
| 21 | 960135 |
| 22 | 1193424 |
| 23 | 1470000 |
| 24 | 1795625 |
| 25 | 2176551 |
| 26 | 2619540 |
| 27 | 3131884 |
| 28 | 3721425 |
| 29 | 4396575 |
| 30 | 5166336 |
| 31 | 6040320 |
| 32 | 7028769 |
| 33 | 8142575 |
[1,15,84,300,825,1911,3920,7344,12825,21175,33396, 50700,74529,106575,148800,203456,273105,360639, 469300,602700,764841,960135,1193424,1470000, 1795625,2176551,2619540,3131884,3721425,4396575, 5166336,6040320,7028769,8142575] |