The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 64 |
| 3 | 504 |
| 4 | 3934 |
| 5 | 30464 |
| 6 | 234358 |
| 7 | 1792788 |
| 8 | 13648124 |
| 9 | 103462888 |
| 10 | 781425950 |
| 11 | 5882591244 |
| 12 | 44155349024 |
| 13 | 330570580264 |
| 14 | 2469019630228 |
| 15 | 18401868960784 |
| 16 | 136886638563766 |
| 17 | 1016473079300584 |
| 18 | 7535834884502158 |
| 19 | 55785961230032092 |
[8,64,504,3934,30464,234358,1792788,13648124, 103462888,781425950,5882591244,44155349024, 330570580264,2469019630228,18401868960784, 136886638563766,1016473079300584,7535834884502158, 55785961230032092] |