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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 29 |
| 3 | 149 |
| 4 | 751 |
| 5 | 3761 |
| 6 | 18839 |
| 7 | 94201 |
| 8 | 471007 |
| 9 | 2355037 |
| 10 | 11775191 |
| 11 | 58875961 |
| 12 | 294379823 |
| 13 | 1471899119 |
| 14 | 7359495683 |
| 15 | 36797478433 |
| 16 | 183987392167 |
| 17 | 919936960849 |
| 18 | 4599684804259 |
| 19 | 22998424021409 |
| 20 | 114992120107093 |
| 21 | 574960600535527 |
[5,29,149,751,3761,18839,94201,471007,2355037, 11775191,58875961,294379823,1471899119,7359495683, 36797478433,183987392167,919936960849, 4599684804259,22998424021409,114992120107093, 574960600535527] |