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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 151 |
| 4 | 26512143 |
| 5 | 318400215865581346424671 |
| 6 | 1240913164837493520914469575281720548839055905624577375251388717505927743 |
[1,3,151,26512143,318400215865581346424671, 12409131648374935209144695752817205488390559056245\ 77375251388717505927743] |