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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 13 |
| 3 | 189 |
| 4 | 128710 |
| 5 | 35991498064 |
| 6 | 2446078720414903993789 |
| 7 | 6931718522045386540619325319488373066793530 |
| 8 | 101356214921150956342075804556293213603111493400038238181610140160229154442797508951110 |
[4,13,189,128710,35991498064, 2446078720414903993789, 6931718522045386540619325319488373066793530, 10135621492115095634207580455629321360311149340003\ 8238181610140160229154442797508951110] |