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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 33 |
| 3 | 223 |
| 4 | 1537 |
| 5 | 11007 |
| 6 | 80385 |
| 7 | 595455 |
| 8 | 4456449 |
| 9 | 33615871 |
| 10 | 255148033 |
| 11 | 1946337279 |
| 12 | 14908784641 |
| 13 | 114597822463 |
| 14 | 883479412737 |
| 15 | 6828492980223 |
| 16 | 52895475040257 |
| 17 | 410544577183743 |
| 18 | 3191929428770817 |
| 19 | 24855137310736383 |
| 20 | 193811815161921537 |
| 21 | 1513167009951514623 |
| 22 | 11827298001565515777 |
[1,7,33,223,1537,11007,80385,595455,4456449, 33615871,255148033,1946337279,14908784641, 114597822463,883479412737,6828492980223, 52895475040257,410544577183743,3191929428770817, 24855137310736383,193811815161921537, 1513167009951514623,11827298001565515777] |