The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 49 |
| 3 | 304 |
| 4 | 1876 |
| 5 | 11556 |
| 6 | 71152 |
| 7 | 438048 |
| 8 | 2696784 |
| 9 | 16602304 |
| 10 | 102209216 |
| 11 | 629233216 |
| 12 | 3873764352 |
| 13 | 23848153088 |
| 14 | 146816985344 |
| 15 | 903853103104 |
| 16 | 5564413613056 |
| 17 | 34256339608576 |
| 18 | 210893165924352 |
| 19 | 1298326906544128 |
| 20 | 7992922619695104 |
[8,49,304,1876,11556,71152,438048,2696784, 16602304,102209216,629233216,3873764352, 23848153088,146816985344,903853103104, 5564413613056,34256339608576,210893165924352, 1298326906544128,7992922619695104] |