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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 33 |
| 3 | 211 |
| 4 | 1269 |
| 5 | 7109 |
| 6 | 37881 |
| 7 | 195927 |
| 8 | 996933 |
| 9 | 5029417 |
| 10 | 25262121 |
| 11 | 126608171 |
| 12 | 633821781 |
| 13 | 3171197325 |
| 14 | 15861685497 |
| 15 | 79324281727 |
| 16 | 396666275397 |
| 17 | 1983460173617 |
| 18 | 9917674841193 |
| 19 | 49589469690579 |
| 20 | 247950578857365 |
| 21 | 1239762467069077 |
[5,33,211,1269,7109,37881,195927,996933,5029417, 25262121,126608171,633821781,3171197325, 15861685497,79324281727,396666275397, 1983460173617,9917674841193,49589469690579, 247950578857365,1239762467069077] |