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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 21 |
| 3 | 28 |
| 4 | 55 |
| 5 | 91 |
| 6 | 171 |
| 7 | 253 |
| 8 | 276 |
| 9 | 351 |
| 10 | 406 |
| 11 | 465 |
| 12 | 496 |
| 13 | 595 |
| 14 | 666 |
| 15 | 820 |
| 16 | 861 |
| 17 | 1081 |
| 18 | 1225 |
| 19 | 1378 |
| 20 | 1431 |
| 21 | 1485 |
| 22 | 1540 |
| 23 | 1653 |
| 24 | 1770 |
| 25 | 1891 |
| 26 | 2211 |
| 27 | 2346 |
| 28 | 2485 |
| 29 | 2850 |
| 30 | 3003 |
| 31 | 3160 |
| 32 | 3240 |
| 33 | 3403 |
| 34 | 3655 |
| 35 | 3916 |
| 36 | 4186 |
| 37 | 4371 |
| 38 | 4560 |
| 39 | 4753 |
| 40 | 4950 |
[1,21,28,55,91,171,253,276,351,406,465,496,595, 666,820,861,1081,1225,1378,1431,1485,1540,1653, 1770,1891,2211,2346,2485,2850,3003,3160,3240,3403, 3655,3916,4186,4371,4560,4753,4950] |