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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 35 |
| 3 | 143 |
| 4 | 899 |
| 5 | 1763 |
| 6 | 5183 |
| 7 | 19043 |
| 8 | 79523 |
| 9 | 213443 |
| 10 | 359999 |
| 11 | 412163 |
| 12 | 685583 |
| 13 | 777923 |
| 14 | 1192463 |
| 15 | 1695203 |
| 16 | 2585663 |
| 17 | 4536899 |
| 18 | 5143823 |
| 19 | 5673923 |
| 20 | 7225343 |
| 21 | 12446783 |
| 22 | 12659363 |
| 23 | 12830723 |
| 24 | 17040383 |
| 25 | 17892899 |
| 26 | 18818243 |
| 27 | 20684303 |
| 28 | 25100099 |
[15,35,143,899,1763,5183,19043,79523,213443, 359999,412163,685583,777923,1192463,1695203, 2585663,4536899,5143823,5673923,7225343,12446783, 12659363,12830723,17040383,17892899,18818243, 20684303,25100099] |