The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 64 |
| 3 | 94 |
| 4 | 297 |
| 5 | 931 |
| 6 | 2870 |
| 7 | 8058 |
| 8 | 25040 |
| 9 | 76568 |
| 10 | 231646 |
| 11 | 698547 |
| 12 | 2127306 |
| 13 | 6445956 |
| 14 | 19552446 |
| 15 | 59312328 |
| 16 | 179989186 |
| 17 | 545864508 |
| 18 | 1655917962 |
| 19 | 5023513454 |
| 20 | 15239822168 |
| 21 | 46229536379 |
| 22 | 140240525936 |
| 23 | 425432765173 |
| 24 | 1290586351293 |
| 25 | 3915080833618 |
[16,64,94,297,931,2870,8058,25040,76568,231646, 698547,2127306,6445956,19552446,59312328, 179989186,545864508,1655917962,5023513454, 15239822168,46229536379,140240525936,425432765173, 1290586351293,3915080833618] |