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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 21 |
| 2 | 48 |
| 3 | 81 |
| 4 | 120 |
| 5 | 165 |
| 6 | 216 |
| 7 | 273 |
| 8 | 336 |
| 9 | 405 |
| 10 | 480 |
| 11 | 561 |
| 12 | 648 |
| 13 | 741 |
| 14 | 840 |
| 15 | 945 |
| 16 | 1056 |
| 17 | 1173 |
| 18 | 1296 |
| 19 | 1425 |
| 20 | 1560 |
| 21 | 1701 |
| 22 | 1848 |
| 23 | 2001 |
| 24 | 2160 |
| 25 | 2325 |
| 26 | 2496 |
| 27 | 2673 |
| 28 | 2856 |
| 29 | 3045 |
| 30 | 3240 |
| 31 | 3441 |
| 32 | 3648 |
| 33 | 3861 |
| 34 | 4080 |
| 35 | 4305 |
| 36 | 4536 |
| 37 | 4773 |
| 38 | 5016 |
| 39 | 5265 |
| 40 | 5520 |
| 41 | 5781 |
[0,21,48,81,120,165,216,273,336,405,480,561,648, 741,840,945,1056,1173,1296,1425,1560,1701,1848, 2001,2160,2325,2496,2673,2856,3045,3240,3441,3648, 3861,4080,4305,4536,4773,5016,5265,5520,5781] |