The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 18 |
| 2 | 810 |
| 3 | 10206 |
| 4 | 65610 |
| 5 | 1299078 |
| 6 | 483611310 |
| 7 | 9565938 |
| 8 | 7317942570 |
| 9 | 103053850074 |
| 10 | 383546284110 |
| 11 | 1443528742014 |
| 12 | 257010878197710 |
| 13 | 5083731656658 |
| 14 | 6634269811938690 |
| 15 | 982924264619854326 |
| 16 | 315013432104812970 |
[1,18,810,10206,65610,1299078,483611310,9565938, 7317942570,103053850074,383546284110, 1443528742014,257010878197710,5083731656658, 6634269811938690,982924264619854326, 315013432104812970] |