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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 62 |
| 4 | 1530 |
| 5 | 50849 |
| 6 | 2089719 |
| 7 | 101470053 |
| 8 | 5660430287 |
| 9 | 355970992756 |
| 10 | 24894562936569 |
| 11 | 1915987357589537 |
| 12 | 160941576221849622 |
| 13 | 14653841416756810665 |
| 14 | 1437868649635368258342 |
| 15 | 151284341822917527109841 |
| 16 | 16993002921809143802858179 |
| 17 | 2029842747191877113876104045 |
[1,1,4,62,1530,50849,2089719,101470053,5660430287, 355970992756,24894562936569,1915987357589537, 160941576221849622,14653841416756810665, 1437868649635368258342,151284341822917527109841, 16993002921809143802858179, 2029842747191877113876104045] |