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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 14698 |
| 4 | 51629528080 |
| 5 | 914192102910317528125 |
| 6 | 199979553262025879510473132453855232 |
| 7 | 1131253316618666789979709230473744963049785439771172168 |
| 8 | 309491168658231587025767619097898747214052900521443034546657433273562730332160 |
[1,1,7,14698,51629528080,914192102910317528125, 199979553262025879510473132453855232, 11312533166186667899797092304737449630497854397711\ 72168, 30949116865823158702576761909789874721405290052144\ 3034546657433273562730332160] |