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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 33 |
| 3 | 164 |
| 4 | 550 |
| 5 | 1455 |
| 6 | 3283 |
| 7 | 6608 |
| 8 | 12204 |
| 9 | 21075 |
| 10 | 34485 |
| 11 | 53988 |
| 12 | 81458 |
| 13 | 119119 |
| 14 | 169575 |
| 15 | 235840 |
| 16 | 321368 |
| 17 | 430083 |
| 18 | 566409 |
| 19 | 735300 |
| 20 | 942270 |
| 21 | 1193423 |
| 22 | 1495483 |
| 23 | 1855824 |
| 24 | 2282500 |
| 25 | 2784275 |
| 26 | 3370653 |
| 27 | 4051908 |
| 28 | 4839114 |
| 29 | 5744175 |
| 30 | 6779855 |
[0,3,33,164,550,1455,3283,6608,12204,21075,34485, 53988,81458,119119,169575,235840,321368,430083, 566409,735300,942270,1193423,1495483,1855824, 2282500,2784275,3370653,4051908,4839114,5744175, 6779855] |