The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 44 |
| 3 | 204 |
| 4 | 852 |
| 5 | 3488 |
| 6 | 14064 |
| 7 | 57188 |
| 8 | 228044 |
| 9 | 908996 |
| 10 | 3633896 |
| 11 | 14522920 |
| 12 | 58046984 |
| 13 | 232143556 |
| 14 | 928391308 |
| 15 | 3713183932 |
[1,8,44,204,852,3488,14064,57188,228044,908996, 3633896,14522920,58046984,232143556,928391308, 3713183932] |