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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 9 |
| 5 | 15 |
| 6 | 20 |
| 7 | 28 |
| 8 | 34 |
| 9 | 45 |
| 10 | 53 |
| 11 | 66 |
| 12 | 76 |
| 13 | 91 |
| 14 | 102 |
| 15 | 120 |
| 16 | 133 |
| 17 | 153 |
| 18 | 168 |
| 19 | 190 |
| 20 | 206 |
| 21 | 231 |
| 22 | 249 |
| 23 | 276 |
| 24 | 296 |
| 25 | 325 |
| 26 | 346 |
| 27 | 378 |
| 28 | 401 |
| 29 | 435 |
| 30 | 460 |
| 31 | 496 |
| 32 | 522 |
| 33 | 561 |
| 34 | 589 |
| 35 | 630 |
| 36 | 660 |
| 37 | 703 |
| 38 | 734 |
| 39 | 780 |
| 40 | 813 |
| 41 | 861 |
| 42 | 896 |
| 43 | 946 |
| 44 | 982 |
| 45 | 1035 |
| 46 | 1073 |
[0,1,2,6,9,15,20,28,34,45,53,66,76,91,102,120,133, 153,168,190,206,231,249,276,296,325,346,378,401, 435,460,496,522,561,589,630,660,703,734,780,813, 861,896,946,982,1035,1073] |