| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 15 |
| 3 | 52 |
| 4 | 197 |
| 5 | 762 |
| 6 | 1635 |
| 7 | 4424 |
| 8 | 9681 |
| 9 | 18006 |
| 10 | 27031 |
| 11 | 39712 |
| 12 | 58889 |
| 13 | 84802 |
| 14 | 114305 |
| 15 | 150856 |
| 16 | 198147 |
| 17 | 256038 |
| 18 | 321105 |
| 19 | 396728 |
| 20 | 485607 |
| 21 | 591270 |
| 22 | 706739 |
| 23 | 836684 |
| 24 | 996031 |
| 25 | 1169410 |
| 26 | 1356535 |
| 27 | 1566720 |
| 28 | 1801223 |
| 29 | 2055290 |
| 30 | 2322411 |
| 31 | 2610784 |
| 32 | 2932121 |
| 33 | 3284562 |
[2,15,52,197,762,1635,4424,9681,18006,27031,39712, 58889,84802,114305,150856,198147,256038,321105, 396728,485607,591270,706739,836684,996031,1169410, 1356535,1566720,1801223,2055290,2322411,2610784, 2932121,3284562] |