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| n | a(n) |
|---|---|
| 1 | 144 |
| 2 | 3129 |
| 3 | 31980 |
| 4 | 183341 |
| 5 | 791668 |
| 6 | 2647405 |
| 7 | 7658288 |
| 8 | 19250197 |
| 9 | 44217384 |
| 10 | 93009121 |
| 11 | 184267580 |
| 12 | 343160689 |
| 13 | 612192168 |
| 14 | 1044502461 |
| 15 | 1724282192 |
| 16 | 2751658457 |
| 17 | 4280852084 |
| 18 | 6482911469 |
| 19 | 9619637248 |
| 20 | 13971461273 |
| 21 | 19950718732 |
[144,3129,31980,183341,791668,2647405,7658288, 19250197,44217384,93009121,184267580,343160689, 612192168,1044502461,1724282192,2751658457, 4280852084,6482911469,9619637248,13971461273, 19950718732] |