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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 115 |
| 4 | 1617 |
| 5 | 30241 |
| 6 | 701923 |
| 7 | 19517975 |
| 8 | 633387905 |
| 9 | 23513238865 |
| 10 | 983268873891 |
| 11 | 45750603668815 |
| 12 | 2344878934878769 |
| 13 | 131285573039583977 |
| 14 | 7973124098907905603 |
| 15 | 522086636316439329511 |
| 16 | 36669284618683152764289 |
| 17 | 2750044026126526125774625 |
| 18 | 219342360538110975815216323 |
[1,2,11,115,1617,30241,701923,19517975,633387905, 23513238865,983268873891,45750603668815, 2344878934878769,131285573039583977, 7973124098907905603,522086636316439329511, 36669284618683152764289,2750044026126526125774625, 219342360538110975815216323] |