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| n | a(n) |
|---|---|
| 2 | 8 |
| 3 | 104 |
| 4 | 670 |
| 5 | 3096 |
| 6 | 11786 |
| 7 | 39564 |
| 8 | 121678 |
| 9 | 350992 |
| 10 | 964338 |
| 11 | 2550356 |
| 12 | 6541846 |
| 13 | 16366616 |
| 14 | 40107066 |
| 15 | 96586332 |
| 16 | 229176926 |
| 17 | 536895520 |
| 18 | 1243957122 |
| 19 | 2854431844 |
| 20 | 6494293670 |
| 21 | 14664265256 |
| 22 | 32889555658 |
| 23 | 73320539244 |
| 24 | 162562734830 |
[8,104,670,3096,11786,39564,121678,350992,964338, 2550356,6541846,16366616,40107066,96586332, 229176926,536895520,1243957122,2854431844, 6494293670,14664265256,32889555658,73320539244, 162562734830] |