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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 224 |
| 11 | 1849 |
| 12 | 11422 |
| 13 | 49981 |
| 14 | 224398 |
| 15 | 1780640 |
| 16 | 22690257 |
| 17 | 281350590 |
| 18 | 2951548767 |
| 19 | 34313995173 |
| 20 | 571260880157 |
| 21 | 12982237127311 |
[1,7,19,37,61,224,1849,11422,49981,224398,1780640, 22690257,281350590,2951548767,34313995173, 571260880157,12982237127311] |