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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 43 |
| 4 | 505 |
| 5 | 7421 |
| 6 | 130501 |
| 7 | 2668975 |
| 8 | 62197073 |
| 9 | 1626103225 |
| 10 | 47116726021 |
| 11 | 1498191224531 |
| 12 | 51855200633545 |
| 13 | 1940384578283893 |
| 14 | 78042911672096645 |
| 15 | 3357060094366363351 |
| 16 | 153771739817047383841 |
| 17 | 7471843888639307665265 |
| 18 | 383835896530177022152453 |
| 19 | 20783664252941721959512315 |
[1,1,5,43,505,7421,130501,2668975,62197073, 1626103225,47116726021,1498191224531, 51855200633545,1940384578283893,78042911672096645, 3357060094366363351,153771739817047383841, 7471843888639307665265,383835896530177022152453, 20783664252941721959512315] |