| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 91 |
| 2 | 3185 |
| 3 | 63700 |
| 4 | 866320 |
| 5 | 8836464 |
| 6 | 71954064 |
| 7 | 488259720 |
| 8 | 2848181700 |
| 9 | 14620666060 |
| 10 | 67255063876 |
| 11 | 281248448936 |
| 12 | 1081724803600 |
| 13 | 3863302870000 |
| 14 | 12914469594000 |
| 15 | 40680579221100 |
| 16 | 121443493851225 |
| 17 | 345280521733875 |
| 18 | 938920716995625 |
| 19 | 2451077240157000 |
| 20 | 6162708489537600 |
[1,91,3185,63700,866320,8836464,71954064, 488259720,2848181700,14620666060,67255063876, 281248448936,1081724803600,3863302870000, 12914469594000,40680579221100,121443493851225, 345280521733875,938920716995625,2451077240157000, 6162708489537600] |