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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 42 |
| 3 | 190 |
| 4 | 806 |
| 5 | 3318 |
| 6 | 13462 |
| 7 | 54230 |
| 8 | 217686 |
| 9 | 872278 |
| 10 | 3492182 |
| 11 | 13974870 |
| 12 | 55911766 |
| 13 | 223671638 |
| 14 | 894735702 |
| 15 | 3579041110 |
| 16 | 14316361046 |
| 17 | 57265837398 |
| 18 | 229064136022 |
| 19 | 916258116950 |
| 20 | 3665035613526 |
| 21 | 14660148745558 |
| 22 | 58640607565142 |
[1,8,42,190,806,3318,13462,54230,217686,872278, 3492182,13974870,55911766,223671638,894735702, 3579041110,14316361046,57265837398,229064136022, 916258116950,3665035613526,14660148745558, 58640607565142] |