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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 13 |
| 3 | 47 |
| 4 | 97 |
| 5 | 419 |
| 6 | 953 |
| 7 | 3019 |
| 8 | 7457 |
| 9 | 20963 |
| 10 | 61609 |
| 11 | 189947 |
| 12 | 557041 |
| 13 | 1614803 |
| 14 | 4840313 |
| 15 | 14430827 |
| 16 | 43276097 |
| 17 | 129959363 |
| 18 | 388862281 |
| 19 | 1165669339 |
| 20 | 3493338001 |
| 21 | 10471887539 |
| 22 | 31395739673 |
[2,5,13,47,97,419,953,3019,7457,20963,61609, 189947,557041,1614803,4840313,14430827,43276097, 129959363,388862281,1165669339,3493338001, 10471887539,31395739673] |