| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 21 |
| 3 | 120 |
| 4 | 210 |
| 5 | 300 |
| 6 | 496 |
| 7 | 595 |
| 8 | 946 |
| 9 | 1378 |
| 10 | 1891 |
| 11 | 2278 |
| 12 | 2485 |
| 13 | 2926 |
| 14 | 3655 |
| 15 | 3916 |
| 16 | 4186 |
| 17 | 4465 |
| 18 | 4753 |
| 19 | 5356 |
| 20 | 5671 |
| 21 | 6328 |
| 22 | 6670 |
| 23 | 7381 |
| 24 | 7750 |
| 25 | 8128 |
| 26 | 8515 |
| 27 | 8911 |
| 28 | 9316 |
| 29 | 9730 |
| 30 | 10011 |
| 31 | 10585 |
| 32 | 11476 |
| 33 | 11935 |
| 34 | 12880 |
| 35 | 13366 |
| 36 | 13861 |
| 37 | 14365 |
| 38 | 15931 |
| 39 | 16471 |
| 40 | 18145 |
| 41 | 18721 |
[3,21,120,210,300,496,595,946,1378,1891,2278,2485, 2926,3655,3916,4186,4465,4753,5356,5671,6328,6670, 7381,7750,8128,8515,8911,9316,9730,10011,10585, 11476,11935,12880,13366,13861,14365,15931,16471, 18145,18721] |