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| n | a(n) |
|---|---|
| 1 | 448 |
| 2 | 2804 |
| 3 | 17200 |
| 4 | 108404 |
| 5 | 666880 |
| 6 | 4221580 |
| 7 | 26023136 |
| 8 | 165444308 |
| 9 | 1021780992 |
| 10 | 6523295060 |
| 11 | 40358959904 |
| 12 | 258707287924 |
| 13 | 1603224318880 |
| 14 | 10317081808148 |
| 15 | 64032676563232 |
| 16 | 413605116397892 |
| 17 | 2570619151590496 |
| 18 | 16663502963008084 |
[448,2804,17200,108404,666880,4221580,26023136, 165444308,1021780992,6523295060,40358959904, 258707287924,1603224318880,10317081808148, 64032676563232,413605116397892,2570619151590496, 16663502963008084] |