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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 120 |
| 3 | 153 |
| 4 | 351 |
| 5 | 406 |
| 6 | 741 |
| 7 | 1891 |
| 8 | 3081 |
| 9 | 3403 |
| 10 | 4465 |
| 11 | 5151 |
| 12 | 5565 |
| 13 | 6555 |
| 14 | 9453 |
| 15 | 9591 |
| 16 | 18721 |
| 17 | 22791 |
| 18 | 38226 |
| 19 | 39903 |
| 20 | 46056 |
| 21 | 52326 |
| 22 | 79401 |
| 23 | 85491 |
| 24 | 91378 |
| 25 | 159895 |
| 26 | 187578 |
| 27 | 207690 |
| 28 | 222111 |
| 29 | 227475 |
| 30 | 229503 |
| 31 | 266815 |
| 32 | 274911 |
| 33 | 280875 |
| 34 | 326028 |
| 35 | 334971 |
| 36 | 354903 |
| 37 | 373680 |
| 38 | 410871 |
| 39 | 474825 |
| 40 | 609960 |
[15,120,153,351,406,741,1891,3081,3403,4465,5151, 5565,6555,9453,9591,18721,22791,38226,39903,46056, 52326,79401,85491,91378,159895,187578,207690, 222111,227475,229503,266815,274911,280875,326028, 334971,354903,373680,410871,474825,609960] |