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| n | a(n) |
|---|---|
| 1 | 187 |
| 2 | 622645 |
| 3 | 2060918000 |
| 4 | 6852264918471 |
| 5 | 22781978610167987 |
| 6 | 75743730886453371522 |
| 7 | 251826890612151285556718 |
| 8 | 837254535307721417534184492 |
| 9 | 2783639010978210077196779661724 |
[187,622645,2060918000,6852264918471, 22781978610167987,75743730886453371522, 251826890612151285556718, 837254535307721417534184492, 2783639010978210077196779661724] |