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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 17 |
| 3 | 116 |
| 4 | 455 |
| 5 | 1677 |
| 6 | 8091 |
| 7 | 28448 |
| 8 | 117304 |
| 9 | 513841 |
| 10 | 1871262 |
| 11 | 7963314 |
| 12 | 32859835 |
| 13 | 125032724 |
| 14 | 531287384 |
| 15 | 2129046798 |
| 16 | 8380565700 |
| 17 | 35092450158 |
| 18 | 139319279619 |
| 19 | 559869375850 |
| 20 | 2308650810237 |
| 21 | 9177286253390 |
| 22 | 37241010454269 |
| 23 | 151821739788451 |
[4,17,116,455,1677,8091,28448,117304,513841, 1871262,7963314,32859835,125032724,531287384, 2129046798,8380565700,35092450158,139319279619, 559869375850,2308650810237,9177286253390, 37241010454269,151821739788451] |