| n | a(n) |
|---|---|
| 1 | 11 |
| 2 | 55 |
| 3 | 440 |
| 4 | 3630 |
| 5 | 32208 |
| 6 | 295020 |
| 7 | 2783880 |
| 8 | 26793030 |
| 9 | 261994040 |
| 10 | 2593726344 |
| 11 | 25937424600 |
| 12 | 261535549220 |
| 13 | 2655593241840 |
| 14 | 27124986721140 |
| 15 | 278483211283552 |
| 16 | 2871858103075830 |
| 17 | 29732178147017280 |
[11,55,440,3630,32208,295020,2783880,26793030, 261994040,2593726344,25937424600,261535549220, 2655593241840,27124986721140,278483211283552, 2871858103075830,29732178147017280] |
