The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 132 |
| 3 | 132 |
| 4 | 1571 |
| 5 | 3798 |
| 6 | 1571 |
| 7 | 18995 |
| 8 | 112194 |
| 9 | 112194 |
| 10 | 18995 |
| 11 | 230395 |
| 12 | 3315908 |
| 13 | 8080990 |
| 14 | 3315908 |
| 15 | 230395 |
| 16 | 2794651 |
| 17 | 97991800 |
| 18 | 582449912 |
| 19 | 582449912 |
| 20 | 97991800 |
| 21 | 2794651 |
| 22 | 33899863 |
| 23 | 2895999006 |
| 24 | 41971475967 |
| 25 | 102557201298 |
| 26 | 41971475967 |
[15,132,132,1571,3798,1571,18995,112194,112194, 18995,230395,3315908,8080990,3315908,230395, 2794651,97991800,582449912,582449912,97991800, 2794651,33899863,2895999006,41971475967, 102557201298,41971475967] |