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| n | a(n) |
|---|---|
| 1 | 90 |
| 2 | 534 |
| 3 | 3004 |
| 4 | 17424 |
| 5 | 99380 |
| 6 | 572192 |
| 7 | 3277236 |
| 8 | 18825580 |
| 9 | 107963840 |
| 10 | 619734876 |
| 11 | 3555590252 |
| 12 | 20405232856 |
| 13 | 117085241588 |
| 14 | 671895102796 |
| 15 | 3855486448064 |
| 16 | 22124270945452 |
| 17 | 126955643098236 |
| 18 | 728515542322936 |
| 19 | 4180454758322084 |
[90,534,3004,17424,99380,572192,3277236,18825580, 107963840,619734876,3555590252,20405232856, 117085241588,671895102796,3855486448064, 22124270945452,126955643098236,728515542322936, 4180454758322084] |