The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 50 |
| 3 | 504 |
| 4 | 5870 |
| 5 | 76872 |
| 6 | 1111646 |
| 7 | 17522664 |
| 8 | 298133054 |
| 9 | 5433157512 |
| 10 | 105396184478 |
| 11 | 2165189912040 |
| 12 | 46901678992958 |
| 13 | 1067332196912136 |
| 14 | 25435754924426270 |
| 15 | 633014456504059368 |
| 16 | 16411191933603611198 |
| 17 | 442258823578968351624 |
[1,6,50,504,5870,76872,1111646,17522664,298133054, 5433157512,105396184478,2165189912040, 46901678992958,1067332196912136,25435754924426270, 633014456504059368,16411191933603611198, 442258823578968351624] |