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| n | a(n) |
|---|---|
| 1 | 1575 |
| 2 | 6615 |
| 3 | 26528 |
| 4 | 112334 |
| 5 | 470807 |
| 6 | 1946072 |
| 7 | 8108104 |
| 8 | 33749405 |
| 9 | 140139039 |
| 10 | 582872782 |
| 11 | 2424232694 |
| 12 | 10076881075 |
| 13 | 41899814371 |
| 14 | 174230232505 |
| 15 | 724397027179 |
| 16 | 3011944328140 |
| 17 | 12523598001417 |
| 18 | 52071590286001 |
| 19 | 216507575162589 |
[1575,6615,26528,112334,470807,1946072,8108104, 33749405,140139039,582872782,2424232694, 10076881075,41899814371,174230232505,724397027179, 3011944328140,12523598001417,52071590286001, 216507575162589] |