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| n | a(n) |
|---|---|
| 0 | 5 |
| 1 | 33 |
| 2 | 215 |
| 3 | 1391 |
| 4 | 8965 |
| 5 | 57657 |
| 6 | 370375 |
| 7 | 2377639 |
| 8 | 15257765 |
| 9 | 97891953 |
| 10 | 627990935 |
| 11 | 4028394431 |
| 12 | 25840152805 |
| 13 | 165748456137 |
| 14 | 1063161046855 |
| 15 | 6819395977399 |
| 16 | 43741255696325 |
| 17 | 280566449483073 |
| 18 | 1799615613815255 |
| 19 | 11543127800041871 |
[5,33,215,1391,8965,57657,370375,2377639,15257765, 97891953,627990935,4028394431,25840152805, 165748456137,1063161046855,6819395977399, 43741255696325,280566449483073,1799615613815255, 11543127800041871] |