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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 16 |
| 2 | 86 |
| 3 | 464 |
| 4 | 2508 |
| 5 | 13568 |
| 6 | 73432 |
| 7 | 397504 |
| 8 | 2151984 |
| 9 | 11650816 |
| 10 | 63078752 |
| 11 | 341518592 |
| 12 | 1849046208 |
| 13 | 10011109376 |
| 14 | 54202228096 |
| 15 | 293462293504 |
| 16 | 1588867154688 |
| 17 | 8602465128448 |
| 18 | 46575580861952 |
| 19 | 252170135097344 |
| 20 | 1365302948711424 |
| 21 | 7392041698328576 |
| 22 | 40022092304668672 |
[3,16,86,464,2508,13568,73432,397504,2151984, 11650816,63078752,341518592,1849046208, 10011109376,54202228096,293462293504, 1588867154688,8602465128448,46575580861952, 252170135097344,1365302948711424,7392041698328576, 40022092304668672] |