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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 12 |
| 4 | 21 |
| 5 | 33 |
| 6 | 51 |
| 7 | 75 |
| 8 | 105 |
| 9 | 147 |
| 10 | 201 |
| 11 | 267 |
| 12 | 354 |
| 13 | 462 |
| 14 | 591 |
| 15 | 753 |
| 16 | 948 |
| 17 | 1176 |
| 18 | 1455 |
| 19 | 1785 |
| 20 | 2166 |
| 21 | 2622 |
| 22 | 3153 |
| 23 | 3759 |
| 24 | 4470 |
| 25 | 5286 |
| 26 | 6207 |
| 27 | 7275 |
| 28 | 8490 |
| 29 | 9852 |
| 30 | 11415 |
| 31 | 13179 |
| 32 | 15144 |
| 33 | 17376 |
| 34 | 19875 |
| 35 | 22641 |
| 36 | 25761 |
| 37 | 29235 |
| 38 | 33063 |
| 39 | 37353 |
| 40 | 42105 |
| 41 | 47319 |
| 42 | 53124 |
[1,3,6,12,21,33,51,75,105,147,201,267,354,462,591, 753,948,1176,1455,1785,2166,2622,3153,3759,4470, 5286,6207,7275,8490,9852,11415,13179,15144,17376, 19875,22641,25761,29235,33063,37353,42105,47319, 53124] |