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| n | a(n) |
|---|---|
| 1 | 500 |
| 2 | 538 |
| 3 | 771 |
| 4 | 1511 |
| 5 | 3501 |
| 6 | 9040 |
| 7 | 24411 |
| 8 | 66516 |
| 9 | 182350 |
| 10 | 501847 |
| 11 | 1381865 |
| 12 | 3805521 |
| 13 | 10483208 |
| 14 | 28880671 |
| 15 | 79563282 |
| 16 | 219191950 |
| 17 | 603867313 |
| 18 | 1663633281 |
| 19 | 4583249193 |
| 20 | 12626700608 |
| 21 | 34786146677 |
| 22 | 95834675528 |
| 23 | 264021359180 |
| 24 | 727370137909 |
[500,538,771,1511,3501,9040,24411,66516,182350, 501847,1381865,3805521,10483208,28880671,79563282, 219191950,603867313,1663633281,4583249193, 12626700608,34786146677,95834675528,264021359180, 727370137909] |