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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 20 |
| 4 | 67 |
| 5 | 254 |
| 6 | 825 |
| 7 | 2667 |
| 8 | 8652 |
| 9 | 27929 |
| 10 | 91436 |
| 11 | 297311 |
| 12 | 965014 |
| 13 | 3135633 |
| 14 | 10174603 |
| 15 | 33030794 |
| 16 | 107154304 |
| 17 | 347714014 |
| 18 | 1127972498 |
| 19 | 3659419980 |
| 20 | 11870924983 |
| 21 | 38508782933 |
| 22 | 124917347816 |
| 23 | 405214920992 |
| 24 | 1314447547691 |
| 25 | 4263837727610 |
[4,8,20,67,254,825,2667,8652,27929,91436,297311, 965014,3135633,10174603,33030794,107154304, 347714014,1127972498,3659419980,11870924983, 38508782933,124917347816,405214920992, 1314447547691,4263837727610] |