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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 912 |
| 4 | 3358 |
| 5 | 13902 |
| 6 | 60762 |
| 7 | 284108 |
| 8 | 1384420 |
| 9 | 7001532 |
| 10 | 36242874 |
| 11 | 191029826 |
| 12 | 1018248682 |
| 13 | 5472087028 |
| 14 | 29556555912 |
| 15 | 160218127504 |
| 16 | 870447242906 |
| 17 | 4736443652506 |
| 18 | 25798272697626 |
| 19 | 140613098735224 |
| 20 | 766743297033876 |
[16,256,912,3358,13902,60762,284108,1384420, 7001532,36242874,191029826,1018248682,5472087028, 29556555912,160218127504,870447242906, 4736443652506,25798272697626,140613098735224, 766743297033876] |