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| n | a(n) |
|---|---|
| 0 | 28 |
| 1 | 1569 |
| 2 | 87892 |
| 3 | 4923521 |
| 4 | 275805068 |
| 5 | 15450007329 |
| 6 | 865476215492 |
| 7 | 48482118074881 |
| 8 | 2715864088408828 |
| 9 | 152136871068969249 |
| 10 | 8522380643950686772 |
| 11 | 477405452932307428481 |
| 12 | 26743227744853166681708 |
| 13 | 1498098159164709641604129 |
| 14 | 83920240140968593096512932 |
[28,1569,87892,4923521,275805068,15450007329, 865476215492,48482118074881,2715864088408828, 152136871068969249,8522380643950686772, 477405452932307428481,26743227744853166681708, 1498098159164709641604129, 83920240140968593096512932] |