| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 13 |
| 4 | 26 |
| 5 | 57 |
| 6 | 116 |
| 7 | 231 |
| 8 | 450 |
| 9 | 859 |
| 10 | 1604 |
| 11 | 2928 |
| 12 | 5228 |
| 13 | 9139 |
| 14 | 15653 |
| 15 | 26282 |
| 16 | 43275 |
| 17 | 69900 |
| 18 | 110803 |
| 19 | 172457 |
| 20 | 263715 |
| 21 | 396482 |
| 22 | 586522 |
| 23 | 854417 |
| 24 | 1226696 |
| 25 | 1737153 |
| 26 | 2428374 |
| 27 | 3353494 |
| 28 | 4578206 |
| 29 | 6183045 |
| 30 | 8265971 |
| 31 | 10945276 |
| 32 | 14362841 |
| 33 | 18687770 |
| 34 | 24120429 |
[4,4,13,26,57,116,231,450,859,1604,2928,5228,9139, 15653,26282,43275,69900,110803,172457,263715, 396482,586522,854417,1226696,1737153,2428374, 3353494,4578206,6183045,8265971,10945276,14362841, 18687770,24120429] |