| n | a(n) |
|---|---|
| 1 | 11 |
| 2 | 78 |
| 3 | 545 |
| 4 | 3459 |
| 5 | 19270 |
| 6 | 93428 |
| 7 | 396804 |
| 8 | 1495926 |
| 9 | 5079770 |
| 10 | 15751596 |
| 11 | 45136888 |
| 12 | 120738965 |
| 13 | 304047638 |
| 14 | 725911911 |
| 15 | 1652919000 |
| 16 | 3607621216 |
| 17 | 7579528833 |
| 18 | 15385065750 |
| 19 | 30266189863 |
| 20 | 57863160815 |
| 21 | 107762341802 |
| 22 | 195911924170 |
[11,78,545,3459,19270,93428,396804,1495926, 5079770,15751596,45136888,120738965,304047638, 725911911,1652919000,3607621216,7579528833, 15385065750,30266189863,57863160815,107762341802, 195911924170] |