The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 233 |
| 5 | 2071 |
| 6 | 21305 |
| 7 | 249271 |
| 8 | 3270713 |
| 9 | 47580151 |
| 10 | 760192505 |
| 11 | 13234467511 |
| 12 | 249383390393 |
| 13 | 5057242311031 |
| 14 | 109820924003705 |
| 15 | 2542685745501751 |
| 16 | 62527556173577273 |
| 17 | 1627581948113854711 |
| 18 | 44708026328035782905 |
| 19 | 1292443104462527895991 |
| 20 | 39223568601129844839353 |
[1,1,5,31,233,2071,21305,249271,3270713,47580151, 760192505,13234467511,249383390393,5057242311031, 109820924003705,2542685745501751, 62527556173577273,1627581948113854711, 44708026328035782905,1292443104462527895991, 39223568601129844839353] |