| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 7 |
| 3 | 17 |
| 4 | 44 |
| 5 | 112 |
| 6 | 289 |
| 7 | 743 |
| 8 | 1911 |
| 9 | 4913 |
| 10 | 12633 |
| 11 | 32482 |
| 12 | 83521 |
| 13 | 214756 |
| 14 | 552198 |
| 15 | 1419857 |
| 16 | 3650852 |
| 17 | 9387369 |
| 18 | 24137569 |
| 19 | 62064487 |
| 20 | 159585272 |
| 21 | 410338673 |
| 22 | 1055096276 |
| 23 | 2712949630 |
| 24 | 6975757441 |
| 25 | 17936636689 |
| 26 | 46120143717 |
| 27 | 118587876497 |
| 28 | 304922823712 |
| 29 | 784042443182 |
[1,3,7,17,44,112,289,743,1911,4913,12633,32482, 83521,214756,552198,1419857,3650852,9387369, 24137569,62064487,159585272,410338673,1055096276, 2712949630,6975757441,17936636689,46120143717, 118587876497,304922823712,784042443182] |