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| n | a(n) |
|---|---|
| 1 | 28 |
| 2 | 672 |
| 3 | 20972 |
| 4 | 870473 |
| 5 | 41299256 |
| 6 | 1976588468 |
| 7 | 89730161098 |
| 8 | 3776527762052 |
| 9 | 146582077597322 |
| 10 | 5255148833158068 |
| 11 | 174697385422916429 |
| 12 | 5408652963998274118 |
| 13 | 156617481905320805788 |
| 14 | 4258375831859896074183 |
| 15 | 109105728055490259454053 |
[28,672,20972,870473,41299256,1976588468, 89730161098,3776527762052,146582077597322, 5255148833158068,174697385422916429, 5408652963998274118,156617481905320805788, 4258375831859896074183,109105728055490259454053] |