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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 21 |
| 3 | 60 |
| 4 | 118 |
| 5 | 195 |
| 6 | 291 |
| 7 | 406 |
| 8 | 540 |
| 9 | 693 |
| 10 | 865 |
| 11 | 1056 |
| 12 | 1266 |
| 13 | 1495 |
| 14 | 1743 |
| 15 | 2010 |
| 16 | 2296 |
| 17 | 2601 |
| 18 | 2925 |
| 19 | 3268 |
| 20 | 3630 |
| 21 | 4011 |
| 22 | 4411 |
| 23 | 4830 |
| 24 | 5268 |
| 25 | 5725 |
| 26 | 6201 |
| 27 | 6696 |
| 28 | 7210 |
| 29 | 7743 |
| 30 | 8295 |
| 31 | 8866 |
| 32 | 9456 |
| 33 | 10065 |
| 34 | 10693 |
| 35 | 11340 |
| 36 | 12006 |
| 37 | 12691 |
| 38 | 13395 |
| 39 | 14118 |
[0,1,21,60,118,195,291,406,540,693,865,1056,1266, 1495,1743,2010,2296,2601,2925,3268,3630,4011,4411, 4830,5268,5725,6201,6696,7210,7743,8295,8866,9456, 10065,10693,11340,12006,12691,13395,14118] |