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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 60 |
| 4 | 1848 |
| 5 | 70722 |
| 6 | 3112692 |
| 7 | 151785933 |
| 8 | 8028464085 |
| 9 | 454496257269 |
| 10 | 27288493264020 |
| 11 | 1726435358946081 |
| 12 | 114532053780495258 |
| 13 | 7937351775801976725 |
| 14 | 572926949672305285692 |
| 15 | 42967912938983806922313 |
| 16 | 3341457670910162832959766 |
| 17 | 268988340093587305693448265 |
[1,3,60,1848,70722,3112692,151785933,8028464085, 454496257269,27288493264020,1726435358946081, 114532053780495258,7937351775801976725, 572926949672305285692,42967912938983806922313, 3341457670910162832959766, 268988340093587305693448265] |