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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 24 |
| 3 | 128 |
| 4 | 688 |
| 5 | 3728 |
| 6 | 20224 |
| 7 | 109760 |
| 8 | 595744 |
| 9 | 3233600 |
| 10 | 17551552 |
| 11 | 95267648 |
| 12 | 517101184 |
| 13 | 2806762496 |
| 14 | 15234766720 |
| 15 | 82692468224 |
| 16 | 448844700928 |
| 17 | 2436274668800 |
| 18 | 13223803801600 |
| 19 | 71777205266432 |
| 20 | 389597975982592 |
| 21 | 2114690622553088 |
[5,24,128,688,3728,20224,109760,595744,3233600, 17551552,95267648,517101184,2806762496, 15234766720,82692468224,448844700928, 2436274668800,13223803801600,71777205266432, 389597975982592,2114690622553088] |