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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 15 |
| 3 | 47 |
| 4 | 108 |
| 5 | 206 |
| 6 | 351 |
| 7 | 551 |
| 8 | 816 |
| 9 | 1154 |
| 10 | 1575 |
| 11 | 2087 |
| 12 | 2700 |
| 13 | 3422 |
| 14 | 4263 |
| 15 | 5231 |
| 16 | 6336 |
| 17 | 7586 |
| 18 | 8991 |
| 19 | 10559 |
| 20 | 12300 |
| 21 | 14222 |
| 22 | 16335 |
| 23 | 18647 |
| 24 | 21168 |
| 25 | 23906 |
| 26 | 26871 |
| 27 | 30071 |
| 28 | 33516 |
| 29 | 37214 |
| 30 | 41175 |
| 31 | 45407 |
| 32 | 49920 |
| 33 | 54722 |
| 34 | 59823 |
| 35 | 65231 |
| 36 | 70956 |
| 37 | 77006 |
| 38 | 83391 |
| 39 | 90119 |
| 40 | 97200 |
[0,2,15,47,108,206,351,551,816,1154,1575,2087, 2700,3422,4263,5231,6336,7586,8991,10559,12300, 14222,16335,18647,21168,23906,26871,30071,33516, 37214,41175,45407,49920,54722,59823,65231,70956, 77006,83391,90119,97200] |