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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 28 |
| 3 | 1378 |
| 4 | 111628 |
| 5 | 13507003 |
| 6 | 2282683528 |
| 7 | 513603793828 |
| 8 | 148431496416328 |
| 9 | 53583770206294453 |
| 10 | 23630442660975853828 |
| 11 | 12500504167656226675078 |
| 12 | 7812815104785141671923828 |
| 13 | 5695542211388368278832470703 |
| 14 | 4789950999777617722498107861328 |
[0,1,28,1378,111628,13507003,2282683528, 513603793828,148431496416328,53583770206294453, 23630442660975853828,12500504167656226675078, 7812815104785141671923828, 5695542211388368278832470703, 4789950999777617722498107861328] |