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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 80 |
| 6 | 384 |
| 7 | 2352 |
| 8 | 9856 |
| 9 | 42840 |
| 10 | 169360 |
| 11 | 676720 |
| 12 | 2631072 |
| 13 | 10265216 |
| 14 | 39779600 |
| 15 | 154498280 |
| 16 | 599565952 |
| 17 | 2330826752 |
| 18 | 9068429544 |
| 19 | 35332969392 |
| 20 | 137817174800 |
| 21 | 538204065336 |
| 22 | 2103971573264 |
| 23 | 8233197139552 |
| 24 | 32247054724768 |
[0,0,0,0,0,80,384,2352,9856,42840,169360,676720, 2631072,10265216,39779600,154498280,599565952, 2330826752,9068429544,35332969392,137817174800, 538204065336,2103971573264,8233197139552, 32247054724768] |