| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 14 |
| 3 | 34 |
| 4 | 92 |
| 5 | 317 |
| 6 | 888 |
| 7 | 2626 |
| 8 | 8078 |
| 9 | 24103 |
| 10 | 72107 |
| 11 | 217970 |
| 12 | 656610 |
| 13 | 1975147 |
| 14 | 5955136 |
| 15 | 17950843 |
| 16 | 54086244 |
| 17 | 163025795 |
| 18 | 491430743 |
| 19 | 1481229421 |
| 20 | 4464844849 |
| 21 | 13458804609 |
| 22 | 40569450638 |
| 23 | 122290929298 |
| 24 | 368632726282 |
| 25 | 1111201586358 |
| 26 | 3349591968789 |
[4,14,34,92,317,888,2626,8078,24103,72107,217970, 656610,1975147,5955136,17950843,54086244, 163025795,491430743,1481229421,4464844849, 13458804609,40569450638,122290929298,368632726282, 1111201586358,3349591968789] |