The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 144 |
| 3 | 768 |
| 4 | 5256 |
| 5 | 9216 |
| 6 | 38208 |
| 7 | 50688 |
| 8 | 167688 |
| 9 | 178176 |
| 10 | 487008 |
| 11 | 481536 |
| 12 | 1282464 |
| 13 | 1115136 |
| 14 | 2623104 |
| 15 | 2290176 |
| 16 | 5365512 |
| 17 | 4257792 |
| 18 | 9250896 |
| 19 | 7425792 |
| 20 | 16430256 |
| 21 | 12300288 |
| 22 | 25117632 |
| 23 | 19321344 |
| 24 | 40915872 |
| 25 | 29306880 |
| 26 | 57926880 |
| 27 | 43212288 |
| 28 | 88342848 |
| 29 | 61535232 |
| 30 | 118995840 |
[1,0,144,768,5256,9216,38208,50688,167688,178176, 487008,481536,1282464,1115136,2623104,2290176, 5365512,4257792,9250896,7425792,16430256,12300288, 25117632,19321344,40915872,29306880,57926880, 43212288,88342848,61535232,118995840] |