The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 16 |
| 4 | 64 |
| 5 | 106 |
| 6 | 324 |
| 7 | 696 |
| 8 | 1856 |
| 9 | 4046 |
| 10 | 10240 |
| 11 | 19084 |
| 12 | 49152 |
| 13 | 98110 |
| 14 | 218140 |
| 15 | 464084 |
| 16 | 1047744 |
| 17 | 2123446 |
| 18 | 4718592 |
| 19 | 9632740 |
| 20 | 20666444 |
[2,8,16,64,106,324,696,1856,4046,10240,19084, 49152,98110,218140,464084,1047744,2123446,4718592, 9632740,20666444] |