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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 13 |
| 7 | 28 |
| 8 | 131 |
| 9 | 610 |
| 10 | 2469 |
| 11 | 15728 |
| 12 | 124639 |
| 13 | 969461 |
| 14 | 10411634 |
| 15 | 132835888 |
| 16 | 1807916253 |
[1,4,13,28,131,610,2469,15728,124639,969461, 10411634,132835888,1807916253] |