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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 205 |
| 4 | 913 |
| 5 | 3749 |
| 6 | 15156 |
| 7 | 61104 |
| 8 | 243796 |
| 9 | 969088 |
| 10 | 3868000 |
| 11 | 15443540 |
| 12 | 61714476 |
| 13 | 246673104 |
| 14 | 986343416 |
| 15 | 3944461392 |
[1,5,40,205,913,3749,15156,61104,243796,969088, 3868000,15443540,61714476,246673104,986343416, 3944461392] |