The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 409 |
| 3 | 16081 |
| 4 | 699121 |
| 5 | 32193253 |
| 6 | 1538743249 |
| 7 | 75494983297 |
| 8 | 3776339263873 |
| 9 | 191731486403293 |
| 10 | 9850349744182729 |
| 11 | 510958871182549297 |
| 12 | 26716694098174738321 |
| 13 | 1406361374518034383189 |
| 14 | 74456543501901550262689 |
| 15 | 3961518532003397434536961 |
| 16 | 211689479080817606497324033 |
[1,13,409,16081,699121,32193253,1538743249, 75494983297,3776339263873,191731486403293, 9850349744182729,510958871182549297, 26716694098174738321,1406361374518034383189, 74456543501901550262689,3961518532003397434536961, 211689479080817606497324033] |