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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 990 |
| 3 | 76437 |
| 4 | 6821604 |
| 5 | 662170986 |
| 6 | 67898785806 |
| 7 | 7236062780346 |
| 8 | 793535687872488 |
| 9 | 88963928271478008 |
| 10 | 10150301461460395149 |
| 11 | 1174747280984088520626 |
| 12 | 137580020162886643530525 |
| 13 | 16274396085743934046292733 |
| 14 | 1941610878042595564951651347 |
| 15 | 233359133706492695158857170850 |
[1,18,990,76437,6821604,662170986,67898785806, 7236062780346,793535687872488,88963928271478008, 10150301461460395149,1174747280984088520626, 137580020162886643530525, 16274396085743934046292733, 1941610878042595564951651347, 233359133706492695158857170850] |