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 | 284 |
| 5 | 3390 |
| 6 | 49878 |
| 7 | 871465 |
| 8 | 17620450 |
| 9 | 404554997 |
| 10 | 10394845097 |
| 11 | 295485704544 |
| 12 | 9205957047661 |
| 13 | 311922101632409 |
| 14 | 11419004058232897 |
| 15 | 449146827324857447 |
| 16 | 18889836751306735360 |
| 17 | 845892838094616177138 |
| 18 | 40182354573647684880446 |
[1,1,5,31,284,3390,49878,871465,17620450, 404554997,10394845097,295485704544,9205957047661, 311922101632409,11419004058232897, 449146827324857447,18889836751306735360, 845892838094616177138,40182354573647684880446] |