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| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 200 |
| 3 | 1168 |
| 4 | 7140 |
| 5 | 43780 |
| 6 | 268152 |
| 7 | 1643372 |
| 8 | 10069540 |
| 9 | 61703488 |
| 10 | 378096660 |
| 11 | 2316847540 |
| 12 | 14196847960 |
| 13 | 86993404476 |
| 14 | 533065762516 |
| 15 | 3266444015616 |
| 16 | 20015648328132 |
| 17 | 122649024958372 |
| 18 | 751551142797496 |
| 19 | 4605247533843404 |
[48,200,1168,7140,43780,268152,1643372,10069540, 61703488,378096660,2316847540,14196847960, 86993404476,533065762516,3266444015616, 20015648328132,122649024958372,751551142797496, 4605247533843404] |