The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 15 |
| 3 | 46 |
| 4 | 199 |
| 5 | 245 |
| 6 | 934 |
| 7 | 2113 |
| 8 | 3047 |
| 9 | 11254 |
| 10 | 14301 |
| 11 | 125662 |
| 12 | 265625 |
| 13 | 391287 |
| 14 | 656912 |
| 15 | 1705111 |
| 16 | 4067134 |
| 17 | 26107915 |
| 18 | 186822539 |
| 19 | 399752993 |
| 20 | 8981388385 |
| 21 | 18362529763 |
| 22 | 137519096726 |
| 23 | 843477110119 |
| 24 | 1824473316964 |
| 25 | 4492423744047 |
| 26 | 6316897061011 |
| 27 | 10809320805058 |
| 28 | 27935538671127 |
[1,1,15,46,199,245,934,2113,3047,11254,14301, 125662,265625,391287,656912,1705111,4067134, 26107915,186822539,399752993,8981388385, 18362529763,137519096726,843477110119, 1824473316964,4492423744047,6316897061011, 10809320805058,27935538671127] |