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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 97 |
| 5 | 2251 |
| 6 | 80821 |
| 7 | 4305127 |
| 8 | 332273257 |
| 9 | 36630174931 |
| 10 | 5711638291981 |
| 11 | 1249898984911567 |
| 12 | 381230073532620577 |
| 13 | 161042140788424003291 |
| 14 | 93667063572594041040421 |
| 15 | 74610767840852891620692727 |
| 16 | 80997478506602342803118178457 |
| 17 | 119313601058907927882431190269731 |
| 18 | 237541348427311374857037021264415741 |
[1,1,1,7,97,2251,80821,4305127,332273257, 36630174931,5711638291981,1249898984911567, 381230073532620577,161042140788424003291, 93667063572594041040421, 74610767840852891620692727, 80997478506602342803118178457, 119313601058907927882431190269731, 237541348427311374857037021264415741] |