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| n | a(n) |
|---|---|
| 1 | 256 |
| 2 | 1128 |
| 3 | 5360 |
| 4 | 27376 |
| 5 | 145488 |
| 6 | 802992 |
| 7 | 4552384 |
| 8 | 26458368 |
| 9 | 156639808 |
| 10 | 942349824 |
| 11 | 5736317696 |
| 12 | 35260388992 |
| 13 | 218279005440 |
| 14 | 1358969009152 |
| 15 | 8495762042880 |
| 16 | 53287015270400 |
| 17 | 335031293455360 |
| 18 | 2110452904770560 |
| 19 | 13313109048823808 |
[256,1128,5360,27376,145488,802992,4552384, 26458368,156639808,942349824,5736317696, 35260388992,218279005440,1358969009152, 8495762042880,53287015270400,335031293455360, 2110452904770560,13313109048823808] |