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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 50 |
| 5 | 224 |
| 6 | 320 |
| 7 | 736 |
| 8 | 2400 |
| 9 | 10176 |
| 10 | 12480 |
| 11 | 27264 |
| 12 | 86400 |
| 13 | 359424 |
| 14 | 414720 |
| 15 | 884736 |
| 16 | 2764800 |
| 17 | 11390976 |
| 18 | 12718080 |
| 19 | 26763264 |
| 20 | 82944000 |
| 21 | 339738624 |
| 22 | 371589120 |
| 23 | 775028736 |
| 24 | 2388787200 |
| 25 | 9746251776 |
| 26 | 10510663680 |
| 27 | 21785739264 |
| 28 | 66886041600 |
[1,5,14,50,224,320,736,2400,10176,12480,27264, 86400,359424,414720,884736,2764800,11390976, 12718080,26763264,82944000,339738624,371589120, 775028736,2388787200,9746251776,10510663680, 21785739264,66886041600] |