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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 14 |
| 4 | 25 |
| 5 | 39 |
| 6 | 66 |
| 7 | 99 |
| 8 | 138 |
| 9 | 201 |
| 10 | 274 |
| 11 | 357 |
| 12 | 479 |
| 13 | 616 |
| 14 | 768 |
| 15 | 977 |
| 16 | 1207 |
| 17 | 1458 |
| 18 | 1788 |
| 19 | 2146 |
| 20 | 2532 |
| 21 | 3022 |
| 22 | 3548 |
| 23 | 4110 |
| 24 | 4805 |
| 25 | 5545 |
| 26 | 6330 |
| 27 | 7280 |
| 28 | 8285 |
| 29 | 9345 |
| 30 | 10606 |
| 31 | 11933 |
| 32 | 13326 |
| 33 | 14959 |
| 34 | 16670 |
| 35 | 18459 |
| 36 | 20531 |
| 37 | 22694 |
| 38 | 24948 |
| 39 | 27531 |
| 40 | 30219 |
| 41 | 33012 |
| 42 | 36184 |
| 43 | 39476 |
[1,3,6,14,25,39,66,99,138,201,274,357,479,616,768, 977,1207,1458,1788,2146,2532,3022,3548,4110,4805, 5545,6330,7280,8285,9345,10606,11933,13326,14959, 16670,18459,20531,22694,24948,27531,30219,33012, 36184,39476] |