The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 29 |
| 5 | 121 |
| 6 | 765 |
| 7 | 5041 |
| 8 | 40913 |
| 9 | 363097 |
| 10 | 3643233 |
| 11 | 39916801 |
| 12 | 479535185 |
| 13 | 6227020801 |
| 14 | 87203692929 |
| 15 | 1307676103777 |
| 16 | 20924415922433 |
| 17 | 355687428096001 |
| 18 | 6402505760917569 |
| 19 | 121645100408832001 |
| 20 | 2432915176581403649 |
| 21 | 51090942299733783937 |
| 22 | 1124002321128529922049 |
[1,3,7,29,121,765,5041,40913,363097,3643233, 39916801,479535185,6227020801,87203692929, 1307676103777,20924415922433,355687428096001, 6402505760917569,121645100408832001, 2432915176581403649,51090942299733783937, 1124002321128529922049] |