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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 36 |
| 3 | 320 |
| 4 | 3204 |
| 5 | 34488 |
| 6 | 389320 |
| 7 | 4542784 |
| 8 | 54298992 |
| 9 | 660897208 |
| 10 | 8157832672 |
| 11 | 101824497960 |
| 12 | 1282453483896 |
| 13 | 16272274720064 |
| 14 | 207749196820392 |
| 15 | 2666235340584848 |
| 16 | 34371222980687520 |
| 17 | 444797703379924056 |
| 18 | 5775424372048775480 |
| 19 | 75210745056872493904 |
[1,5,36,320,3204,34488,389320,4542784,54298992, 660897208,8157832672,101824497960,1282453483896, 16272274720064,207749196820392,2666235340584848, 34371222980687520,444797703379924056, 5775424372048775480,75210745056872493904] |