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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 65 |
| 3 | 87 |
| 4 | 652 |
| 5 | 5042 |
| 6 | 35320 |
| 7 | 223750 |
| 8 | 1634125 |
| 9 | 12440063 |
| 10 | 85743693 |
| 11 | 626402775 |
| 12 | 4593707989 |
| 13 | 33301518925 |
| 14 | 242065110566 |
| 15 | 1767254828555 |
| 16 | 12896269372285 |
| 17 | 93959680164405 |
| 18 | 685715068810035 |
| 19 | 5004838983561794 |
| 20 | 36516480551676091 |
[1,65,87,652,5042,35320,223750,1634125,12440063, 85743693,626402775,4593707989,33301518925, 242065110566,1767254828555,12896269372285, 93959680164405,685715068810035,5004838983561794, 36516480551676091] |