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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 330 |
| 3 | 2264 |
| 4 | 15512 |
| 5 | 106128 |
| 6 | 725040 |
| 7 | 4946132 |
| 8 | 33693740 |
| 9 | 229205328 |
| 10 | 1557067320 |
| 11 | 10563664724 |
| 12 | 71575622300 |
| 13 | 484371525216 |
| 14 | 3273973248600 |
| 15 | 22104207166532 |
| 16 | 149072726510492 |
| 17 | 1004302970917488 |
| 18 | 6759180631475928 |
| 19 | 45446982868078004 |
[48,330,2264,15512,106128,725040,4946132,33693740, 229205328,1557067320,10563664724,71575622300, 484371525216,3273973248600,22104207166532, 149072726510492,1004302970917488,6759180631475928, 45446982868078004] |