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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 385 |
| 4 | 4095 |
| 5 | 46375 |
| 6 | 548300 |
| 7 | 6689550 |
| 8 | 83593250 |
| 9 | 1064463125 |
| 10 | 13762667750 |
| 11 | 180189122750 |
| 12 | 2384130651875 |
| 13 | 31829162793750 |
| 14 | 428227113655000 |
| 15 | 5800188020157500 |
| 16 | 79026653220693750 |
| 17 | 1082367047392625000 |
| 18 | 14893567523068062500 |
| 19 | 205796463286063912500 |
[1,5,40,385,4095,46375,548300,6689550,83593250, 1064463125,13762667750,180189122750,2384130651875, 31829162793750,428227113655000,5800188020157500, 79026653220693750,1082367047392625000, 14893567523068062500,205796463286063912500] |