The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 4 |
| 2 | 18 |
| 3 | 392 |
| 4 | 81250 |
| 5 | 225061452 |
| 6 | 9854913828914 |
| 7 | 7821195286733052688 |
| 8 | 128042318400630042200896962 |
| 9 | 48734103316428964151516768659332500 |
| 10 | 480771737247108575104717059364582638896056402 |
| 11 | 135700420467061659867201490569546772642393389614560348824 |
[2,4,18,392,81250,225061452,9854913828914, 7821195286733052688,128042318400630042200896962, 48734103316428964151516768659332500, 480771737247108575104717059364582638896056402, 13570042046706165986720149056954677264239338961456\ 0348824] |