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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 11 |
| 2 | 79 |
| 3 | 468 |
| 4 | 2486 |
| 5 | 12323 |
| 6 | 58277 |
| 7 | 266492 |
| 8 | 1188679 |
| 9 | 5202523 |
| 10 | 22436251 |
| 11 | 95630272 |
| 12 | 403770544 |
| 13 | 1691678428 |
| 14 | 7042481236 |
| 15 | 29161852240 |
| 16 | 120212658034 |
| 17 | 493656394350 |
| 18 | 2020590599710 |
| 19 | 8247228533780 |
| 20 | 33579755528278 |
| 21 | 136434358356201 |
[1,11,79,468,2486,12323,58277,266492,1188679, 5202523,22436251,95630272,403770544,1691678428, 7042481236,29161852240,120212658034,493656394350, 2020590599710,8247228533780,33579755528278, 136434358356201] |