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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 64 |
| 3 | 426 |
| 4 | 3030 |
| 5 | 22560 |
| 6 | 168506 |
| 7 | 1293326 |
| 8 | 9937894 |
| 9 | 77372824 |
| 10 | 604180880 |
| 11 | 4749038012 |
| 12 | 37448196486 |
| 13 | 296429721556 |
| 14 | 2352824897458 |
| 15 | 18723425845436 |
| 16 | 149319341015310 |
| 17 | 1193131013642304 |
| 18 | 9549922015472032 |
| 19 | 76554889282313192 |
[10,64,426,3030,22560,168506,1293326,9937894, 77372824,604180880,4749038012,37448196486, 296429721556,2352824897458,18723425845436, 149319341015310,1193131013642304,9549922015472032, 76554889282313192] |