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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 10 |
| 3 | 30 |
| 4 | 42 |
| 5 | 154 |
| 6 | 478 |
| 7 | 2086 |
| 8 | 8094 |
| 9 | 33766 |
| 10 | 139874 |
| 11 | 595738 |
| 12 | 2519882 |
| 13 | 10738874 |
| 14 | 45886078 |
| 15 | 196936610 |
| 16 | 847655270 |
| 17 | 3659989354 |
| 18 | 15844521472 |
| 19 | 68767896826 |
| 20 | 299141921948 |
| 21 | 1304016379938 |
| 22 | 5695400116694 |
| 23 | 24919428238882 |
| 24 | 109210581420200 |
[6,10,30,42,154,478,2086,8094,33766,139874,595738, 2519882,10738874,45886078,196936610,847655270, 3659989354,15844521472,68767896826,299141921948, 1304016379938,5695400116694,24919428238882, 109210581420200] |