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| n | a(n) |
|---|---|
| 0 | 27 |
| 1 | 28 |
| 2 | 55 |
| 3 | 413 |
| 4 | 881 |
| 5 | 1294 |
| 6 | 4763 |
| 7 | 15583 |
| 8 | 20346 |
| 9 | 544579 |
| 10 | 564925 |
| 11 | 2239354 |
| 12 | 7282987 |
| 13 | 9522341 |
| 14 | 26327669 |
| 15 | 193816024 |
| 16 | 220143693 |
| 17 | 413959717 |
| 18 | 22573968411 |
| 19 | 22987928128 |
| 20 | 45561896539 |
| 21 | 341921203901 |
| 22 | 729404304341 |
[27,28,55,413,881,1294,4763,15583,20346,544579, 564925,2239354,7282987,9522341,26327669,193816024, 220143693,413959717,22573968411,22987928128, 45561896539,341921203901,729404304341] |