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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 15 |
| 3 | 24 |
| 4 | 94 |
| 5 | 145 |
| 6 | 551 |
| 7 | 848 |
| 8 | 3214 |
| 9 | 4945 |
| 10 | 18735 |
| 11 | 28824 |
| 12 | 109198 |
| 13 | 168001 |
| 14 | 636455 |
| 15 | 979184 |
| 16 | 3709534 |
| 17 | 5707105 |
| 18 | 21620751 |
| 19 | 33263448 |
| 20 | 126014974 |
[1,15,24,94,145,551,848,3214,4945,18735,28824, 109198,168001,636455,979184,3709534,5707105, 21620751,33263448,126014974] |