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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 44 |
| 3 | 213 |
| 4 | 908 |
| 5 | 3709 |
| 6 | 14960 |
| 7 | 60616 |
| 8 | 243221 |
| 9 | 973537 |
| 10 | 3895593 |
| 11 | 15594740 |
| 12 | 62380577 |
| 13 | 249510413 |
| 14 | 998069841 |
| 15 | 3992455244 |
[1,5,44,213,908,3709,14960,60616,243221,973537, 3895593,15594740,62380577,249510413,998069841, 3992455244] |