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| n | a(n) |
|---|---|
| 1 | 33 |
| 2 | 90 |
| 3 | 311 |
| 4 | 1096 |
| 5 | 4085 |
| 6 | 15732 |
| 7 | 62039 |
| 8 | 245850 |
| 9 | 980361 |
| 10 | 3915982 |
| 11 | 15667453 |
| 12 | 62726276 |
| 13 | 251241863 |
| 14 | 1006595336 |
| 15 | 4033439213 |
| 16 | 16163623302 |
| 17 | 64777551551 |
| 18 | 259612134798 |
| 19 | 1040482017255 |
| 20 | 4170131147952 |
| 21 | 16713541804781 |
| 22 | 66986842603436 |
[33,90,311,1096,4085,15732,62039,245850,980361, 3915982,15667453,62726276,251241863,1006595336, 4033439213,16163623302,64777551551,259612134798, 1040482017255,4170131147952,16713541804781, 66986842603436] |