The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 18 |
| 3 | 1198 |
| 4 | 76718 |
| 5 | 4909998 |
| 6 | 1256959738 |
| 7 | 1287126772718 |
| 8 | 82376113453998 |
| 9 | 337412560707579838 |
| 10 | 86377615541140438718 |
| 11 | 5528167394632988078010 |
| 12 | 5660843412104179791883246 |
| 13 | 92747258463914881710215118590 |
[2,18,1198,76718,4909998,1256959738,1287126772718, 82376113453998,337412560707579838, 86377615541140438718,5528167394632988078010, 5660843412104179791883246, 92747258463914881710215118590] |