The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 11 |
| 3 | 213 |
| 4 | 5985 |
| 5 | 221661 |
| 6 | 10218531 |
| 7 | 564561201 |
| 8 | 36390748353 |
| 9 | 2682479586105 |
| 10 | 222652398049371 |
| 11 | 20554978625001261 |
| 12 | 2089547699051558241 |
| 13 | 231964689103531639893 |
| 14 | 27924323112643836661875 |
| 15 | 3623564792426316196908681 |
| 16 | 504240479834595078024218241 |
| 17 | 74908344255661216879220109681 |
[1,1,11,213,5985,221661,10218531,564561201, 36390748353,2682479586105,222652398049371, 20554978625001261,2089547699051558241, 231964689103531639893,27924323112643836661875, 3623564792426316196908681, 504240479834595078024218241, 74908344255661216879220109681] |