The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 181 |
| 4 | 3313 |
| 5 | 85681 |
| 6 | 3106081 |
| 7 | 152379361 |
| 8 | 9753972481 |
| 9 | 790089189121 |
| 10 | 79009114867201 |
| 11 | 9560105293939201 |
| 12 | 1376655193941350401 |
| 13 | 232654728224433715201 |
| 14 | 45600326738788914892801 |
| 15 | 10260073516337350497792001 |
| 16 | 2626578820184244778524672001 |
[1,1,13,181,3313,85681,3106081,152379361, 9753972481,790089189121,79009114867201, 9560105293939201,1376655193941350401, 232654728224433715201,45600326738788914892801, 10260073516337350497792001, 2626578820184244778524672001] |