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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 15 |
| 3 | 40 |
| 4 | 77 |
| 5 | 126 |
| 6 | 183 |
| 7 | 288 |
| 8 | 405 |
| 9 | 558 |
| 10 | 719 |
| 11 | 948 |
| 12 | 1201 |
| 13 | 1498 |
| 14 | 1787 |
| 15 | 2204 |
| 16 | 2601 |
| 17 | 3146 |
| 18 | 3731 |
| 19 | 4392 |
| 20 | 5101 |
| 21 | 5846 |
| 22 | 6583 |
| 23 | 7532 |
| 24 | 8441 |
| 25 | 9514 |
| 26 | 10547 |
| 27 | 11856 |
| 28 | 13141 |
| 29 | 14566 |
| 30 | 15855 |
| 31 | 17512 |
| 32 | 19021 |
| 33 | 20902 |
| 34 | 22887 |
| 35 | 25156 |
| 36 | 27393 |
| 37 | 29842 |
| 38 | 32379 |
| 39 | 35104 |
| 40 | 37797 |
| 41 | 40750 |
| 42 | 43679 |
[1,6,15,40,77,126,183,288,405,558,719,948,1201, 1498,1787,2204,2601,3146,3731,4392,5101,5846,6583, 7532,8441,9514,10547,11856,13141,14566,15855, 17512,19021,20902,22887,25156,27393,29842,32379, 35104,37797,40750,43679] |