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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 126 |
| 3 | 4374 |
| 4 | 212382 |
| 5 | 13254678 |
| 6 | 1010905758 |
| 7 | 91110914262 |
| 8 | 9474549870366 |
| 9 | 1116585119599254 |
| 10 | 147069002623426974 |
| 11 | 21409671124376711766 |
| 12 | 3413523019088600429598 |
| 13 | 591567613603935502853142 |
| 14 | 110720237615252672961478302 |
| 15 | 22257774019225889826272194518 |
| 16 | 4782978445116622033501706621214 |
[1,6,126,4374,212382,13254678,1010905758, 91110914262,9474549870366,1116585119599254, 147069002623426974,21409671124376711766, 3413523019088600429598,591567613603935502853142, 110720237615252672961478302, 22257774019225889826272194518, 4782978445116622033501706621214] |