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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 14 |
| 2 | 112 |
| 3 | 672 |
| 4 | 3360 |
| 5 | 14784 |
| 6 | 59136 |
| 7 | 219648 |
| 8 | 768768 |
| 9 | 2562560 |
| 10 | 8200192 |
| 11 | 25346048 |
| 12 | 76038144 |
| 13 | 222265344 |
| 14 | 635043840 |
| 15 | 1778122752 |
| 16 | 4889837568 |
| 17 | 13231325184 |
| 18 | 35283533824 |
| 19 | 92851404800 |
| 20 | 241413652480 |
| 21 | 620777963520 |
| 22 | 1580162088960 |
[1,14,112,672,3360,14784,59136,219648,768768, 2562560,8200192,25346048,76038144,222265344, 635043840,1778122752,4889837568,13231325184, 35283533824,92851404800,241413652480,620777963520, 1580162088960] |