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| n | a(n) |
|---|---|
| 4 | 2 |
| 5 | 18 |
| 6 | 98 |
| 7 | 424 |
| 8 | 1614 |
| 9 | 5682 |
| 10 | 19022 |
| 11 | 61584 |
| 12 | 194882 |
| 13 | 607042 |
| 14 | 1870122 |
| 15 | 5716680 |
| 16 | 17379206 |
| 17 | 52628898 |
| 18 | 158934998 |
| 19 | 479032912 |
| 20 | 1441816986 |
| 21 | 4335412050 |
| 22 | 13027207250 |
| 23 | 39125661480 |
| 24 | 117469258622 |
| 25 | 352600713298 |
| 26 | 1058204792478 |
[2,18,98,424,1614,5682,19022,61584,194882,607042, 1870122,5716680,17379206,52628898,158934998, 479032912,1441816986,4335412050,13027207250, 39125661480,117469258622,352600713298, 1058204792478] |