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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 19 |
| 3 | 59 |
| 4 | 145 |
| 5 | 389 |
| 6 | 1009 |
| 7 | 2651 |
| 8 | 6931 |
| 9 | 18155 |
| 10 | 47521 |
| 11 | 124421 |
| 12 | 325729 |
| 13 | 852779 |
| 14 | 2232595 |
| 15 | 5845019 |
| 16 | 15302449 |
| 17 | 40062341 |
| 18 | 104884561 |
| 19 | 274591355 |
| 20 | 718889491 |
| 21 | 1882077131 |
| 22 | 4927341889 |
| 23 | 12899948549 |
| 24 | 33772503745 |
| 25 | 88417562699 |
| 26 | 231480184339 |
| 27 | 606022990331 |
| 28 | 1586588786641 |
[1,11,19,59,145,389,1009,2651,6931,18155,47521, 124421,325729,852779,2232595,5845019,15302449, 40062341,104884561,274591355,718889491,1882077131, 4927341889,12899948549,33772503745,88417562699, 231480184339,606022990331,1586588786641] |