The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1128 |
| 3 | 1128 |
| 4 | 5360 |
| 5 | 7544 |
| 6 | 5360 |
| 7 | 27376 |
| 8 | 56752 |
| 9 | 56752 |
| 10 | 27376 |
| 11 | 145488 |
| 12 | 471588 |
| 13 | 685244 |
| 14 | 471588 |
| 15 | 145488 |
| 16 | 802992 |
| 17 | 4167736 |
| 18 | 9292680 |
| 19 | 9292680 |
| 20 | 4167736 |
| 21 | 802992 |
| 22 | 4552384 |
| 23 | 38817072 |
| 24 | 134597244 |
| 25 | 205544096 |
| 26 | 134597244 |
| 27 | 38817072 |
| 28 | 4552384 |
[256,1128,1128,5360,7544,5360,27376,56752,56752, 27376,145488,471588,685244,471588,145488,802992, 4167736,9292680,9292680,4167736,802992,4552384, 38817072,134597244,205544096,134597244,38817072, 4552384] |