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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 48 |
| 3 | 162 |
| 4 | 576 |
| 5 | 2102 |
| 6 | 7790 |
| 7 | 29174 |
| 8 | 110112 |
| 9 | 418134 |
| 10 | 1595622 |
| 11 | 6113746 |
| 12 | 23505358 |
| 13 | 90633802 |
| 14 | 350351642 |
| 15 | 1357278302 |
| 16 | 5268292832 |
| 17 | 20483876822 |
| 18 | 79765662902 |
| 19 | 311038321442 |
| 20 | 1214362277702 |
| 21 | 4746455801882 |
| 22 | 18570960418922 |
| 23 | 72728638093802 |
[16,48,162,576,2102,7790,29174,110112,418134, 1595622,6113746,23505358,90633802,350351642, 1357278302,5268292832,20483876822,79765662902, 311038321442,1214362277702,4746455801882, 18570960418922,72728638093802] |