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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 16 |
| 3 | 98 |
| 4 | 643 |
| 5 | 3773 |
| 6 | 23091 |
| 7 | 154228 |
| 8 | 1050811 |
| 9 | 7236644 |
| 10 | 51776044 |
| 11 | 383107149 |
| 12 | 2907310903 |
| 13 | 22583670553 |
| 14 | 180085426836 |
| 15 | 1470632881207 |
[2,16,98,643,3773,23091,154228,1050811,7236644, 51776044,383107149,2907310903,22583670553, 180085426836,1470632881207] |