The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 13 |
| 3 | 9 |
| 4 | 80 |
| 5 | 220 |
| 6 | 518 |
| 7 | 2466 |
| 8 | 8609 |
| 9 | 26954 |
| 10 | 108253 |
| 11 | 391026 |
| 12 | 1364326 |
| 13 | 5142635 |
| 14 | 18805585 |
| 15 | 67927770 |
| 16 | 251558219 |
| 17 | 923421565 |
| 18 | 3375978025 |
| 19 | 12442380432 |
| 20 | 45744080554 |
| 21 | 167955473490 |
| 22 | 618311475706 |
| 23 | 2274757925559 |
| 24 | 8365332143494 |
[5,13,9,80,220,518,2466,8609,26954,108253,391026, 1364326,5142635,18805585,67927770,251558219, 923421565,3375978025,12442380432,45744080554, 167955473490,618311475706,2274757925559, 8365332143494] |