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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 13 |
| 2 | 85 |
| 3 | 559 |
| 4 | 3697 |
| 5 | 24583 |
| 6 | 164305 |
| 7 | 1103479 |
| 8 | 7444417 |
| 9 | 50431303 |
| 10 | 342941425 |
| 11 | 2340123799 |
| 12 | 16018069537 |
| 13 | 109949704423 |
| 14 | 756587236945 |
| 15 | 5217746494519 |
| 16 | 36054040477057 |
| 17 | 249557173431943 |
| 18 | 1729973554578865 |
| 19 | 12008254925383639 |
[2,13,85,559,3697,24583,164305,1103479,7444417, 50431303,342941425,2340123799,16018069537, 109949704423,756587236945,5217746494519, 36054040477057,249557173431943,1729973554578865, 12008254925383639] |