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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 13 |
| 2 | 75 |
| 3 | 469 |
| 4 | 3027 |
| 5 | 19933 |
| 6 | 133275 |
| 7 | 901669 |
| 8 | 6155427 |
| 9 | 42306733 |
| 10 | 292240875 |
| 11 | 2026154869 |
| 12 | 14085427827 |
| 13 | 98109713533 |
| 14 | 684326588475 |
| 15 | 4778079088069 |
| 16 | 33385518460227 |
| 17 | 233393453440333 |
| 18 | 1632228295176075 |
| 19 | 11417968671701269 |
[3,13,75,469,3027,19933,133275,901669,6155427, 42306733,292240875,2026154869,14085427827, 98109713533,684326588475,4778079088069, 33385518460227,233393453440333,1632228295176075, 11417968671701269] |