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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 305 |
| 5 | 3125 |
| 6 | 36479 |
| 7 | 475295 |
| 8 | 6811205 |
| 9 | 106170245 |
| 10 | 1784531879 |
| 11 | 32117927231 |
| 12 | 615413731205 |
| 13 | 12493421510405 |
| 14 | 267608512061159 |
| 15 | 6026688403933967 |
| 16 | 142256385130774229 |
| 17 | 3509899012049396645 |
| 18 | 90301862963332188839 |
| 19 | 2417349828110572405823 |
| 20 | 67201548131159391828677 |
[1,1,5,35,305,3125,36479,475295,6811205,106170245, 1784531879,32117927231,615413731205, 12493421510405,267608512061159,6026688403933967, 142256385130774229,3509899012049396645, 90301862963332188839,2417349828110572405823, 67201548131159391828677] |