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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 105 |
| 3 | 1485 |
| 4 | 18915 |
| 5 | 666435 |
| 6 | 2143485 |
| 7 | 4174605 |
| 8 | 10059855 |
| 9 | 10440165 |
| 10 | 28196295 |
| 11 | 95295915 |
| 12 | 124591005 |
| 13 | 155064855 |
| 14 | 171023265 |
| 15 | 206258205 |
| 16 | 298400235 |
| 17 | 311737965 |
| 18 | 347701635 |
| 19 | 389470095 |
| 20 | 459332895 |
| 21 | 460424685 |
| 22 | 498948255 |
| 23 | 526517475 |
| 24 | 537575655 |
| 25 | 615496155 |
| 26 | 645500415 |
| 27 | 885763005 |
| 28 | 963144105 |
[15,105,1485,18915,666435,2143485,4174605, 10059855,10440165,28196295,95295915,124591005, 155064855,171023265,206258205,298400235,311737965, 347701635,389470095,459332895,460424685,498948255, 526517475,537575655,615496155,645500415,885763005, 963144105] |