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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 33 |
| 3 | 279 |
| 4 | 2895 |
| 5 | 35685 |
| 6 | 509985 |
| 7 | 8294895 |
| 8 | 151335135 |
| 9 | 3061162125 |
| 10 | 68000295825 |
| 11 | 1645756410375 |
| 12 | 43105900812975 |
| 13 | 1214871076343925 |
| 14 | 36659590336994625 |
| 15 | 1179297174137457375 |
| 16 | 40288002704636061375 |
| 17 | 1456700757237661060125 |
[1,5,33,279,2895,35685,509985,8294895,151335135, 3061162125,68000295825,1645756410375, 43105900812975,1214871076343925,36659590336994625, 1179297174137457375,40288002704636061375, 1456700757237661060125] |