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| n | a(n) |
|---|---|
| 1 | 416 |
| 2 | 6872 |
| 3 | 91888 |
| 4 | 706704 |
| 5 | 4149708 |
| 6 | 16909524 |
| 7 | 61034658 |
| 8 | 179220600 |
| 9 | 484680810 |
| 10 | 1179584718 |
| 11 | 2691862296 |
| 12 | 5660060962 |
| 13 | 11419487998 |
| 14 | 21680491596 |
| 15 | 39877845854 |
| 16 | 70202009284 |
| 17 | 120203803140 |
| 18 | 198769546216 |
| 19 | 321758154748 |
| 20 | 506644858160 |
[416,6872,91888,706704,4149708,16909524,61034658, 179220600,484680810,1179584718,2691862296, 5660060962,11419487998,21680491596,39877845854, 70202009284,120203803140,198769546216, 321758154748,506644858160] |