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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 19 |
| 3 | 43 |
| 4 | 111 |
| 5 | 287 |
| 6 | 763 |
| 7 | 2051 |
| 8 | 5575 |
| 9 | 15271 |
| 10 | 42099 |
| 11 | 116651 |
| 12 | 324591 |
| 13 | 906367 |
| 14 | 2538331 |
| 15 | 7126403 |
| 16 | 20049671 |
| 17 | 56509639 |
| 18 | 159514963 |
| 19 | 450865067 |
| 20 | 1275778031 |
| 21 | 3613401695 |
| 22 | 10242581819 |
| 23 | 29053799555 |
| 24 | 82461727687 |
| 25 | 234163952487 |
[1,7,19,43,111,287,763,2051,5575,15271,42099, 116651,324591,906367,2538331,7126403,20049671, 56509639,159514963,450865067,1275778031, 3613401695,10242581819,29053799555,82461727687, 234163952487] |