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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 193 |
| 4 | 841 |
| 5 | 3681 |
| 6 | 14973 |
| 7 | 60789 |
| 8 | 243436 |
| 9 | 973641 |
| 10 | 3881340 |
| 11 | 15520816 |
| 12 | 62025368 |
| 13 | 248008489 |
| 14 | 991871680 |
| 15 | 3967177220 |
[1,5,40,193,841,3681,14973,60789,243436,973641, 3881340,15520816,62025368,248008489,991871680, 3967177220] |