The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 345 |
| 4 | 4938 |
| 5 | 85215 |
| 6 | 1245294 |
| 7 | 18444470 |
| 8 | 278238087 |
| 9 | 4170628296 |
| 10 | 62588525694 |
| 11 | 940255638767 |
| 12 | 14117945596996 |
| 13 | 211965773459470 |
| 14 | 3182555837979301 |
| 15 | 47783850148231569 |
| 16 | 717445698125438780 |
| 17 | 10772054909227440585 |
[1,31,345,4938,85215,1245294,18444470,278238087, 4170628296,62588525694,940255638767, 14117945596996,211965773459470,3182555837979301, 47783850148231569,717445698125438780, 10772054909227440585] |