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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 13 |
| 3 | 29 |
| 4 | 85 |
| 5 | 201 |
| 6 | 689 |
| 7 | 1929 |
| 8 | 4068 |
| 9 | 11963 |
| 10 | 33651 |
| 11 | 80035 |
| 12 | 231111 |
| 13 | 606571 |
| 14 | 1542322 |
| 15 | 4407947 |
| 16 | 11308092 |
| 17 | 29789742 |
| 18 | 82990169 |
| 19 | 213582987 |
| 20 | 572318731 |
| 21 | 1556503937 |
| 22 | 4056412623 |
| 23 | 10923983311 |
| 24 | 29272912317 |
| 25 | 77140259839 |
| 26 | 207516834784 |
[4,13,29,85,201,689,1929,4068,11963,33651,80035, 231111,606571,1542322,4407947,11308092,29789742, 82990169,213582987,572318731,1556503937, 4056412623,10923983311,29272912317,77140259839, 207516834784] |