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| n | a(n) |
|---|---|
| 1 | 4672 |
| 2 | 12544 |
| 3 | 34288 |
| 4 | 95848 |
| 5 | 267424 |
| 6 | 771564 |
| 7 | 2218212 |
| 8 | 6382872 |
| 9 | 18265360 |
| 10 | 52177252 |
| 11 | 149258712 |
| 12 | 427853252 |
| 13 | 1226410112 |
| 14 | 3513633704 |
| 15 | 10058786964 |
| 16 | 28806493432 |
| 17 | 82512239868 |
| 18 | 236383009160 |
| 19 | 677059152856 |
| 20 | 1939300994548 |
| 21 | 5554357282184 |
[4672,12544,34288,95848,267424,771564,2218212, 6382872,18265360,52177252,149258712,427853252, 1226410112,3513633704,10058786964,28806493432, 82512239868,236383009160,677059152856, 1939300994548,5554357282184] |