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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 48 |
| 3 | 1253 |
| 4 | 45040 |
| 5 | 2074266 |
| 6 | 115308621 |
| 7 | 7403931515 |
| 8 | 542578637369 |
| 9 | 44353623326199 |
| 10 | 3992458392860603 |
| 11 | 392255543503496555 |
| 12 | 41726405940340028501 |
| 13 | 4768006168373548992878 |
| 14 | 582709500037368041005243 |
| 15 | 75765509130126834789261446 |
| 16 | 10436240655486571146294062847 |
[1,3,48,1253,45040,2074266,115308621,7403931515, 542578637369,44353623326199,3992458392860603, 392255543503496555,41726405940340028501, 4768006168373548992878,582709500037368041005243, 75765509130126834789261446, 10436240655486571146294062847] |