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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 34 |
| 4 | 287 |
| 5 | 2863 |
| 6 | 32746 |
| 7 | 420736 |
| 8 | 5983449 |
| 9 | 93133215 |
| 10 | 1572620167 |
| 11 | 28601774854 |
| 12 | 556966811404 |
| 13 | 11554566786712 |
| 14 | 254272882352574 |
| 15 | 5913584928252552 |
| 16 | 144873520289993221 |
| 17 | 3727881181448196395 |
| 18 | 100497262518486193227 |
| 19 | 2831814367381689184110 |
| 20 | 83232066231023514044175 |
[1,1,5,34,287,2863,32746,420736,5983449,93133215, 1572620167,28601774854,556966811404, 11554566786712,254272882352574,5913584928252552, 144873520289993221,3727881181448196395, 100497262518486193227,2831814367381689184110, 83232066231023514044175] |