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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 79 |
| 10 | 331 |
| 11 | 1971 |
| 12 | 11437 |
| 13 | 56649 |
| 14 | 326778 |
| 15 | 2556228 |
| 16 | 26440896 |
| 17 | 303972325 |
| 18 | 3581795416 |
| 19 | 47721457149 |
| 20 | 785585027118 |
[1,7,19,37,79,331,1971,11437,56649,326778,2556228, 26440896,303972325,3581795416,47721457149, 785585027118] |