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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 10 |
| 7 | 22 |
| 8 | 40 |
| 9 | 103 |
| 10 | 496 |
| 11 | 3099 |
| 12 | 16980 |
| 13 | 88897 |
| 14 | 547244 |
| 15 | 4508233 |
| 16 | 48937458 |
| 17 | 595010305 |
| 18 | 7745612856 |
| 19 | 114311761273 |
[1,4,10,22,40,103,496,3099,16980,88897,547244, 4508233,48937458,595010305,7745612856, 114311761273] |