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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 126 |
| 4 | 2601 |
| 5 | 139605 |
| 6 | 17098225 |
| 7 | 4412968520 |
| 8 | 2580469555456 |
| 9 | 3485691022698248 |
| 10 | 10640054910525548209 |
| 11 | 72722981173167013234455 |
| 12 | 1123008691175260414001447481 |
| 13 | 39309117808240836879763740048294 |
[2,16,126,2601,139605,17098225,4412968520, 2580469555456,3485691022698248, 10640054910525548209,72722981173167013234455, 1123008691175260414001447481, 39309117808240836879763740048294] |