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| n | a(n) |
|---|---|
| 4 | 24 |
| 5 | 60 |
| 6 | 300 |
| 7 | 1260 |
| 8 | 6496 |
| 9 | 20916 |
| 10 | 95640 |
| 11 | 353760 |
| 12 | 1600104 |
| 13 | 5626764 |
| 14 | 23844002 |
| 15 | 88442445 |
| 16 | 387629456 |
| 17 | 1389902524 |
| 18 | 5788974504 |
| 19 | 21752247660 |
| 20 | 93252286444 |
| 21 | 340374221376 |
| 22 | 1409907258122 |
| 23 | 5335751835865 |
| 24 | 22620834658096 |
| 25 | 83728749708760 |
| 26 | 345377277971570 |
| 27 | 1315699675342065 |
[24,60,300,1260,6496,20916,95640,353760,1600104, 5626764,23844002,88442445,387629456,1389902524, 5788974504,21752247660,93252286444,340374221376, 1409907258122,5335751835865,22620834658096, 83728749708760,345377277971570,1315699675342065] |