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| n | a(n) |
|---|---|
| 1 | 413 |
| 2 | 1936 |
| 3 | 8926 |
| 4 | 45985 |
| 5 | 240448 |
| 6 | 1320659 |
| 7 | 7401826 |
| 8 | 42660605 |
| 9 | 250029914 |
| 10 | 1490326011 |
| 11 | 8987278254 |
| 12 | 54752835613 |
| 13 | 336083185542 |
| 14 | 2075776885383 |
| 15 | 12881680165752 |
| 16 | 80247514417805 |
| 17 | 501418885256186 |
| 18 | 3140749716392509 |
[413,1936,8926,45985,240448,1320659,7401826, 42660605,250029914,1490326011,8987278254, 54752835613,336083185542,2075776885383, 12881680165752,80247514417805,501418885256186, 3140749716392509] |