| n | a(n) |
|---|---|
| 0 | 20 |
| 1 | 21 |
| 2 | 41 |
| 3 | 62 |
| 4 | 103 |
| 5 | 165 |
| 6 | 268 |
| 7 | 10885 |
| 8 | 11153 |
| 9 | 22038 |
| 10 | 33191 |
| 11 | 55229 |
| 12 | 88420 |
| 13 | 143649 |
| 14 | 5834380 |
| 15 | 5978029 |
| 16 | 11812409 |
| 17 | 17790438 |
| 18 | 29602847 |
| 19 | 47393285 |
| 20 | 76996132 |
| 21 | 3127238565 |
| 22 | 3204234697 |
| 23 | 6331473262 |
| 24 | 9535707959 |
| 25 | 15867181221 |
| 26 | 25402889180 |
| 27 | 41270070401 |
| 28 | 1676205705220 |
[20,21,41,62,103,165,268,10885,11153,22038,33191, 55229,88420,143649,5834380,5978029,11812409, 17790438,29602847,47393285,76996132,3127238565, 3204234697,6331473262,9535707959,15867181221, 25402889180,41270070401,1676205705220] |