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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 99 |
| 4 | 2444 |
| 5 | 101450 |
| 6 | 7045194 |
| 7 | 701736966 |
| 8 | 97147459184 |
| 9 | 17505366041880 |
| 10 | 4005462950166600 |
| 11 | 1128394974054308400 |
| 12 | 384386423684496873672 |
| 13 | 155497732356686080354968 |
| 14 | 73718160600338917089657216 |
| 15 | 40462026280443230503858113240 |
[1,1,8,99,2444,101450,7045194,701736966, 97147459184,17505366041880,4005462950166600, 1128394974054308400,384386423684496873672, 155497732356686080354968, 73718160600338917089657216, 40462026280443230503858113240] |