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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 41 |
| 4 | 845 |
| 5 | 30012 |
| 6 | 1650475 |
| 7 | 130216865 |
| 8 | 13944696526 |
| 9 | 1945060435587 |
| 10 | 342412144747677 |
| 11 | 74216506678085290 |
| 12 | 19414505134246518741 |
| 13 | 6029823819095965829293 |
| 14 | 2193174302711080501699684 |
| 15 | 923346371767630311443639677 |
| 16 | 445468655004100653462280596881 |
| 17 | 244137607569262412209821327718964 |
[1,1,4,41,845,30012,1650475,130216865,13944696526, 1945060435587,342412144747677,74216506678085290, 19414505134246518741,6029823819095965829293, 2193174302711080501699684, 923346371767630311443639677, 445468655004100653462280596881, 244137607569262412209821327718964] |