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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 17 |
| 4 | 149 |
| 5 | 1934 |
| 6 | 44821 |
| 7 | 1631629 |
| 8 | 89057367 |
| 9 | 6849428873 |
| 10 | 713780361312 |
| 11 | 97876276145119 |
| 12 | 17259548258350637 |
| 13 | 3840154740252625874 |
| 14 | 1060662127742505706789 |
| 15 | 358584059544008234423217 |
| 16 | 146560585570176100774010071 |
| 17 | 71630591614693085251230481320 |
| 18 | 41456445821273701849195905028292 |
[1,4,17,149,1934,44821,1631629,89057367, 6849428873,713780361312,97876276145119, 17259548258350637,3840154740252625874, 1060662127742505706789,358584059544008234423217, 146560585570176100774010071, 71630591614693085251230481320, 41456445821273701849195905028292] |