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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 105 |
| 4 | 100 |
| 5 | 1875 |
| 6 | 840 |
| 7 | 31527 |
| 8 | 6800 |
| 9 | 514639 |
| 10 | 55584 |
| 11 | 8311967 |
| 12 | 447040 |
| 13 | 133613887 |
| 14 | 3581056 |
| 15 | 2142671487 |
| 16 | 28723456 |
| 17 | 34321278207 |
| 18 | 229937664 |
| 19 | 549448731135 |
| 20 | 1839801344 |
| 21 | 8793637557247 |
| 22 | 14723205120 |
| 23 | 140717847029759 |
| 24 | 117795229696 |
| 25 | 2251642721423359 |
| 26 | 942381015040 |
[1,4,10,105,100,1875,840,31527,6800,514639,55584, 8311967,447040,133613887,3581056,2142671487, 28723456,34321278207,229937664,549448731135, 1839801344,8793637557247,14723205120, 140717847029759,117795229696,2251642721423359, 942381015040] |