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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 5 |
| 3 | 11 |
| 4 | 56 |
| 5 | 617 |
| 6 | 34553 |
| 7 | 21319202 |
| 8 | 736642386707 |
| 9 | 15704627843968647815 |
| 10 | 11568694537326272321321120595206 |
| 11 | 181682042349262169758803442669575561298555791374891 |
| 12 | 2101824050856189730969091901210449068013789839106586804501928241686514359003372547 |
[2,2,5,11,56,617,34553,21319202,736642386707, 15704627843968647815, 11568694537326272321321120595206, 18168204234926216975880344266957556129855579137489\ 1, 21018240508561897309690919012104490680137898391065\ 86804501928241686514359003372547] |