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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 23 |
| 3 | 82 |
| 4 | 239 |
| 5 | 619 |
| 6 | 1471 |
| 7 | 3259 |
| 8 | 6800 |
| 9 | 13464 |
| 10 | 25453 |
| 11 | 46178 |
| 12 | 80755 |
| 13 | 136643 |
| 14 | 224449 |
| 15 | 358927 |
| 16 | 560200 |
| 17 | 855236 |
| 18 | 1279611 |
| 19 | 1879594 |
| 20 | 2714591 |
| 21 | 3859987 |
| 22 | 5410427 |
| 23 | 7483579 |
| 24 | 10224424 |
| 25 | 13810120 |
| 26 | 18455489 |
| 27 | 24419178 |
| 28 | 32010547 |
| 29 | 41597339 |
| 30 | 53614189 |
| 31 | 68572031 |
[4,23,82,239,619,1471,3259,6800,13464,25453,46178, 80755,136643,224449,358927,560200,855236,1279611, 1879594,2714591,3859987,5410427,7483579,10224424, 13810120,18455489,24419178,32010547,41597339, 53614189,68572031] |