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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 90 |
| 2 | 4455 |
| 3 | 160380 |
| 4 | 4691115 |
| 5 | 118216098 |
| 6 | 2659862205 |
| 7 | 54717165360 |
| 8 | 1046465787510 |
| 9 | 18836384175180 |
| 10 | 322102169395578 |
| 11 | 5270762771927640 |
| 12 | 83014513657860330 |
| 13 | 1264374900327411180 |
| 14 | 18694686026269579590 |
| 15 | 269203478778281946096 |
| 16 | 3785673920319589866975 |
| 17 | 52108688079693178168950 |
| 18 | 703467289075857905280825 |
[1,90,4455,160380,4691115,118216098,2659862205, 54717165360,1046465787510,18836384175180, 322102169395578,5270762771927640, 83014513657860330,1264374900327411180, 18694686026269579590,269203478778281946096, 3785673920319589866975,52108688079693178168950, 703467289075857905280825] |