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| n | a(n) |
|---|---|
| 1 | 128 |
| 2 | 64 |
| 3 | 224 |
| 4 | 784 |
| 5 | 2800 |
| 6 | 10000 |
| 7 | 36000 |
| 8 | 129600 |
| 9 | 468000 |
| 10 | 1690000 |
| 11 | 6110000 |
| 12 | 22090000 |
| 13 | 79900000 |
| 14 | 289000000 |
| 15 | 1045500000 |
| 16 | 3782250000 |
| 17 | 13683750000 |
| 18 | 49506250000 |
| 19 | 179112500000 |
| 20 | 648025000000 |
| 21 | 2344562500000 |
| 22 | 8482656250000 |
| 23 | 30690468750000 |
[128,64,224,784,2800,10000,36000,129600,468000, 1690000,6110000,22090000,79900000,289000000, 1045500000,3782250000,13683750000,49506250000, 179112500000,648025000000,2344562500000, 8482656250000,30690468750000] |