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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 19 |
| 3 | 47 |
| 4 | 113 |
| 5 | 273 |
| 6 | 659 |
| 7 | 1591 |
| 8 | 3841 |
| 9 | 9273 |
| 10 | 22387 |
| 11 | 54047 |
| 12 | 130481 |
| 13 | 315009 |
| 14 | 760499 |
| 15 | 1836007 |
| 16 | 4432513 |
| 17 | 10701033 |
| 18 | 25834579 |
| 19 | 62370191 |
| 20 | 150574961 |
| 21 | 363520113 |
| 22 | 877615187 |
| 23 | 2118750487 |
| 24 | 5115116161 |
| 25 | 12348982809 |
| 26 | 29813081779 |
| 27 | 71975146367 |
[1,9,19,47,113,273,659,1591,3841,9273,22387,54047, 130481,315009,760499,1836007,4432513,10701033, 25834579,62370191,150574961,363520113,877615187, 2118750487,5115116161,12348982809,29813081779, 71975146367] |